The high mobility group (HMG) protein HMG-D from Drosophila melanogaster is a highly abundant chromosomal protein that is closely related to the vertebrate HMG domain proteins HMG1 and HMG2. In ...general, chromosomal HMG domain proteins lack sequence specificity. However, using both NMR spectroscopy and standard biochemical techniques we show that binding of HMG-D to a single DNA site is sequence selective. The preferred duplex DNA binding site comprises at least 5 bp and contains the deformable dinucleotide TG embedded in A/T-rich sequences. The TG motif constitutes a common core element in the binding sites of the well characterized sequence-specific HMG domain proteins. We show that a conserved aromatic residue in helix 1 of the HMG domain may be involved in recognition of this core sequence. In common with other HMG domain proteins HMG-D binds preferentially to DNA sites that are stably bent and underwound, therefore HMG-D can be considered an architecture-specific protein. Finally, we show that HMG-D bends DNA and may confer a superhelical DNA conformation at a natural DNA binding site in the Drosophila fushi tarazu scaffold-associated region.
Zoos embrace docents/volunteers as a means of interpreting the threats to wildlife and biodiversity to visitors. To accomplish this, zoos provide docents' education, training, and work experience. ...Docents themselves also engage in solitary and social wildlife experiences outside of their volunteer obligations. This study examined what motivates docents and how they change as part of their experience. Results from a mailback questionnaire (91% response rate, n = 365) documented that both altruistic (interpreting wildlife to visitors) and egoistic (learning about wildlife themselves; socializing with like-minded others) motivations were predictive of continuing satisfaction with their volunteer experiences. Docents also reported starting or increasing many conservation behaviors after beginning to volunteer at the Cleveland Metroparks Zoo. Docents with more years of experience tended to report more involvement with conservation behaviors. Results support an environmental socialization framework to explain the impacts of an environmental training program. Implications for future research and practice are presented.
To describe why, when and to whom general practitioners refer women with symptoms possibly attributable to cervical, endometrial or ovarian cancers, and to identify patient and GP factors that ...predict referral to either a gynaecologist or a gynaecological oncologist.
A national survey of GPs between 1 April and 31 August 2009 using a randomised incomplete block design based on case vignettes, and using a self-completed postal or online questionnaire.
A sample of GPs, stratified by location and randomly selected from a database of GPs maintained by the Australasian Medical Publishing Company.
Proportion of vignettes that were deemed to reflect a high probability of cancer being referred; and the patient and clinician factors that were the strongest predictors of referral.
Of the 3082 GPs who were selected for participation, 1402 responded, giving a response rate of 45.5%. Overall, for vignettes identified as describing women with a high probability of cancer, 75% were referred by metropolitan GPs and 73% by rural practitioners. Metropolitan GPs were significantly more likely to refer women in scenarios indicative of endometrial cancer than rural GPs. For all three cancers, GPs were significantly more likely to refer a patient to a gynaecologist (between 70.8% and 95.4%) than a gynaecological oncologist. Metropolitan GPs had significantly greater access to both private and public gynaecological oncologists than their rural counterparts. Referral rates were higher for ovarian and cervical cancer (83% and 80%, respectively) and lower for endometrial cancer (68%). For all three cancers, patient factors were stronger predictors of referral than the demographic factors of participating GPs.
There appears to be significant variation in referral practices among GPs and this variation is greater for endometrial cancer, for which there are currently no evidence-based clinical practice guidelines in Australia. There is a need for further research into understanding the basis of these differences, including a review of the existing guidelines for ovarian and cervical cancer and the development of guidelines for endometrial cancer.
A joint determination of the reactor antineutrino spectra resulting from the fission of 235U and 239Pu has been carried out by the Daya Bay and PROSPECT Collaborations. This Letter reports the level ...of consistency of 235U spectrum measurements from the two experiments and presents new results from a joint analysis of both data sets. Here, the measurements are found to be consistent. The combined analysis reduces the degeneracy between the dominant 235U and 239Pu isotopes and improves the uncertainty of the 235U spectral shape to about 3%. The 235U and 239Pu antineutrino energy spectra are unfolded from the jointly deconvolved reactor spectra using the Wiener-SVD unfolding method, providing a data-based reference for other reactor antineutrino experiments and other applications. This is the first measurement of the 235U and 239Pu spectra based on the combination of experiments at low- and highly enriched uranium reactors.
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The HMG-box is a conserved DNA-binding motif that has been identified in many high mobility group (HMG) proteins. HMG-D is a non-histone chromosomal protein from Drosophila melanogaster that is ...closely related to the mammalian HMG-box proteins HMG-1 and HMG-2. Previous structures determined for an HMG-box domain from rat and hamster exhibit the same global topology, but differ significantly in detail. It has been suggested that these differences may arise from hinge motions which allow the protein to adapt to the shape of its target DNA.
We present the solution structure of HMG-D determined by NMR spectroscopy to an overall precision of 0.85 A root mean squared deviation (rmsd) for the backbone atoms. The protein consists of an extended amino-terminal region and three alpha-helices that fold into a characteristic 'L' shape. The central core region of the molecule is highly stable and maintains an angle of approximately 80 degrees between the axes of helices 2 and 3. The backbone dynamics determined from 15N NMR relaxation measurements show a high correlation with the mean residue rmsd determined from the calculated structures.
The structure determined for the HMG-box motif from HMG-D is essentially identical to the structure determined for the B-domain of mammalian HMG-1. Since these proteins have significantly different sequences our results indicate that the global fold and the mode of interaction with DNA are also likely to be conserved in all eukaryotes.
This Letter reports one of the most precise measurements to date of the antineutrino spectrum from a purely ^{235}U-fueled reactor, made with the final dataset from the PROSPECT-I detector at the ...High Flux Isotope Reactor. By extracting information from previously unused detector segments, this analysis effectively doubles the statistics of the previous PROSPECT measurement. The reconstructed energy spectrum is unfolded into antineutrino energy and compared with both the Huber-Mueller model and a spectrum from a commercial reactor burning multiple fuel isotopes. A local excess over the model is observed in the 5-7 MeV energy region. Comparison of the PROSPECT results with those from commercial reactors provides new constraints on the origin of this excess, disfavoring at 2.0 and 3.7 standard deviations the hypotheses that antineutrinos from ^{235}U are solely responsible and noncontributors to the excess observed at commercial reactors, respectively.
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