399 research outputs found
Physical and dynamical characterisation of low Delta-V NEA (190491) 2000 FJ10
We investigated the physical properties and dynamical evolution of Near Earth
Asteroid (NEA) (190491) 2000 FJ10 in order to assess the suitability of this
accessible NEA as a space mission target. Photometry and colour determination
were carried out with the 1.54 m Kuiper Telescope and the 10 m Southern African
Large Telescope during the object's recent favourable apparition in 2011-12.
During the earlier 2008 apparition, a spectrum of the object in the 6000-9000
Angstrom region was obtained with the 4.2 m William Herschel Telescope.
Interpretation of the observational results was aided by numerical simulations
of 1000 dynamical clones of 2000 FJ10 up to 10^6 yr in the past and in the
future. The asteroid's spectrum and colours determined by our observations
suggest a taxonomic classification within the S-complex although other
classifications (V, D, E, M, P) cannot be ruled out. On this evidence, it is
unlikely to be a primitive, relatively unaltered remnant from the early history
of the solar system and thus a low priority target for robotic sample return.
Our photometry placed a lower bound of 2 hrs to the asteroid's rotation period.
Its absolute magnitude was estimated to be 21.54+-0.1 which, for a typical
S-complex albedo, translates into a diameter of 130+-20 m. Our dynamical
simulations show that it has likely been an Amor for the past 10^5 yr. Although
currently not Earth-crossing, it will likely become so during the period 50 -
100 kyr in the future. It may have arrived from the inner or central Main Belt
> 1 Myr ago as a former member of a low-inclination S-class asteroid family.
Its relatively slow rotation and large size make it a suitable destination for
a human mission. We show that ballistic Earth-190491-Earth transfer
trajectories with Delta-V < 2 km s^-1 at the asteroid exist between 2052 and
2061.Comment: 2 Tables, 11 Figures, accepted for publication in Astronomy &
Astrophysic
Spatial distribution of micrometreāscale porosity and permeability across the damage zone of a reverseāreactivated normal fault in a tight sandstone : Insights from the Otway Basin, SE Australia
This research forms part of a PhD project supported by the Australian Research Council [Discovery Project DP160101158] and through an Australian Government Research Training Program Scholarship. Dave Healy acknowledges the support of the Natural Environment Research Council (NERC, UK) through the award NE/N003063/1 āQuantifying the Anisotropy of Permeability in Stressed Rockā. This study was also funded by scholarships from the Petroleum Exploration Society of Australia and the Australian Petroleum Production and Exploration Association. We thank Gordon Holm for preparing thin sections and Colin Taylor for carrying out particle size measurements and mercury injection capillary pressure analyses. Aoife McFadden and David Kelsey from Adelaide Microscopy, Braden Morgan, and Sophie Harland are acknowledged for their assistance with laboratory work. Field assistants James Hall, Rowan Hansberry, and Lachlan Furness are also gratefully acknowledged for their assistance with sample collection. Discussions with Ian Duddy on the mineralogy of the Eumeralla Formation are also greatly appreciated. This forms TRaX record 416.Peer reviewedPublisher PD
PENGELOALAAN SDM UNTUK PENGEMBANGAN WISATA GOA GUDAWANG
Pengabdian Kepada Masyarakat ini bertujuan untuk membantu mengembangkan wisata Goa Gudawang dari segi manajemen kususnya pengelolaan SDM. Permasalahan yang diangkat mengenai pengelolaan SDM wisata Goa Gudawang adalah kurangnya SDM yang professional sehingga tujuan organisasi sulit dicapai. Metode pelaksanaan pengabdian ini dilakukan dalam beberapa kegiatan yaitu (a). Tahap Persiapan meliputi : (1). Survey awal (2) Pemantapan dan penentuan lokasi sasaran, (3). Penyusunan bahan/materi pelatihan. Hasil kegiatan ini sangat bermanfaat bagi pengelola wisata Goa Gudawang dalam menambah wawasan serta pengetahuan mengenai manajemen strategi.Kata Kunci: Manajemen SDM, Pengelol
RANCANG BANGUN SISTEM INFORMASI TERINTEGRASI AUDIOVISUAL UNTUK OSCE (OBJECTIVE STRUCTURED CLINICAL EXAMINATION)
Sistem Informasi menjadi penunjang di era modern, termasuk di dunia medis dalam bidang pendidikan kedokteran. Dalam pendidikan kedokteran, Sistem InformasiĆĀ digunakan dalam membantu kelancaran pendidikan kedokteran, baik untuk pengajaran, pengujian hingga penilaian. Metoda pengujian dalam Pendidikan kedokteran salah satunya adalah OSCE (Objective Structured Clinical Examination). Pelaksanaan OSCE membutuhkan sumber daya yang besar. Sistem Informasi diintegrasikan dengan sistem audio visual diterapkan untuk meningkatkan efisiensi sumber dayanya didesain untuk pelaksanaan OCSE di fakultas Kedokteran Unswagati. Kemudian desain yang dibuat diujicobakan dalam lingkup sendiri dengan harapan bahwa penerapan Sistem Informasi terintegrasi audiovisual, menjadikan pelaksanaan OSCEĆĀ reliabel, valid dan efisie
RIPK3-mediated cell death is involved in DUX4-mediated toxicity in facioscapulohumeral dystrophy
BACKGROUND: Facioscapulohumeral dystrophy (FSHD) is caused by mutations leading to the aberrant expression of the DUX4 transcription factor in muscles. DUX4 was proposed to induce cell death, but the involvement of different death pathways is still discussed. A possible pro-apoptotic role of DUX4 was proposed, but as FSHD muscles are characterized by necrosis and inflammatory infiltrates, non-apoptotic pathways may be also involved. METHODS: We explored DUX4-mediated cell death by focusing on the role of one regulated necrosis pathway called necroptosis, which is regulated by RIPK3. We investigated the effect of necroptosis on cell death in vitro and in vivo experiments using RIPK3 inhibitors and a RIPK3-deficient transgenic mouse model. RESULTS: We showed in vitro that DUX4 expression causes a caspase-independent and RIPK3-mediated cell death in both myoblasts and myotubes. In vivo, RIPK3-deficient animals present improved body and muscle weights, a reduction of the aberrant activation of the DUX4 network genes, and an improvement of muscle histology. CONCLUSIONS: These results provide evidence for a role of RIPK3 in DUX4-mediated cell death and open new avenues of research
The value of rapid functional assays of germline p53 status in LFS and LFL families
We have tested two rapid assays of p53 function, namely the apoptotic assay and the FASAY as means of detecting germline p53 mutations in members of LiāFraumeni and LiāFraumeni-like families. Results of the functional assays have been compared with direct sequencing of all 11 exons of the p53 gene. The results show good agreement between the two functional assays and between them and sequencing. No false-positives or negatives were seen with either functional assay although the apoptotic assay gave one borderline result for an individual without a mutation. As an initial screen the apoptotic assay is not only rapid but inexpensive and very simple to perform. It would be expected to detect any germline defect that leads to loss of p53 function. The apoptotic assay could be ideal as a means of prescreening large numbers of samples and identifying those that require further investigation. The FASAY detects mutations in exons 4ā10, is rapid and distinguishes between functionally important and silent mutations. Ā© 2000 Cancer Research Campaig
A realist review of medication optimisation of community dwelling service users with serious mental illness
Background:Ā Severe mental illness (SMI) incorporates schizophrenia, bipolar disorder, non-organic psychosis, personality disorder or any other severe and enduring mental health illness. Medication, particularly antipsychotics and mood stabilisers are the main treatment options. Medication optimisation is a hallmark of medication safety, characterised by the use of collaborative, person-centred approaches. There is very little published research describing medication optimisation with people living with SMI.
Objective:Ā Published literature and two stakeholder groups were employed to answer: What works for whom and in what circumstances to optimise medication use with people living with SMI in the community?
Methods:Ā A five-stage realist review was co-conducted with a lived experience group of individuals living with SMI and a practitioner group caring for individuals with SMI. An initial programme theory was developed. A formal literature search was conducted across eight bibliographic databases, and literature were screened for relevance to programme theory refinement. In total 60 papers contributed to the review. 42 papers were from the original database search with 18 papers identified from additional database searches and citation searches conducted based on stakeholder recommendations.
Results:Ā Our programme theory represents a continuum from a service userās initial diagnosis of SMI to therapeutic alliance development with practitioners, followed by mutual exchange of information, shared decision-making and medication optimisation. Accompanying the programme theory are 11 context-mechanism-outcome configurations that propose evidence-informed contextual factors and mechanisms that either facilitate or impede medication optimisation. Two mid-range theories highlighted in this review are supported decision-making and trust formation.
Conclusions:Ā Supported decision-making and trust are foundational to overcoming stigma and establishing āsafetyā and comfort between service users and practitioners. Avenues for future research include the influence of stigma and equity across cultural and ethnic groups with individuals with SMI; and use of trained supports, such as peer support workers.
PROSPERO registration number:Ā CRD42021280980
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Pharmacological and Toxicological Properties of the Potent Oral Ī³-Secretase Modulator BPN-15606.
Alzheimer's disease (AD) is characterized neuropathologically by an abundance of 1) neuritic plaques, which are primarily composed of a fibrillar 42-amino-acid amyloid-Ī² peptide (AĪ²), as well as 2) neurofibrillary tangles composed of aggregates of hyperphosporylated tau. Elevations in the concentrations of the AĪ²42 peptide in the brain, as a result of either increased production or decreased clearance, are postulated to initiate and drive the AD pathologic process. We initially introduced a novel class of bridged aromatics referred tĪ³-secretase modulatoro as Ī³-secretase modulators that inhibited the production of the AĪ²42 peptide and to a lesser degree the AĪ²40 peptide while concomitantly increasing the production of the carboxyl-truncated AĪ²38 and AĪ²37 peptides. These modulators potently lower AĪ²42 levels without inhibiting the Ī³-secretase-mediated proteolysis of Notch or causing accumulation of carboxyl-terminal fragments of APP. In this study, we report a large number of pharmacological studies and early assessment of toxicology characterizing a highly potent Ī³-secretase modulator (GSM), (S)-N-(1-(4-fluorophenyl)ethyl)-6-(6-methoxy-5-(4-methyl-1H-imidazol-1-yl)pyridin-2-yl)-4-methylpyridazin-3-amine (BPN-15606). BPN-15606 displayed the ability to significantly lower AĪ²42 levels in the central nervous system of rats and mice at doses as low as 5-10 mg/kg, significantly reduce AĪ² neuritic plaque load in an AD transgenic mouse model, and significantly reduce levels of insoluble AĪ²42 and pThr181 tau in a three-dimensional human neural cell culture model. Results from repeat-dose toxicity studies in rats and dose escalation/repeat-dose toxicity studies in nonhuman primates have designated this GSM for 28-day Investigational New Drug-enabling good laboratory practice studies and positioned it as a candidate for human clinical trials
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