Publications

CCDC 147133: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

PTF11rka: an interacting supernova at the crossroads of stripped-envelope and H-poor superluminous stellar core collapses

ABSTRACT The hydrogen-poor supernova (SN) PTF11rka (z = 0.0744), reported by the Palomar Transient Factory, was observed with various telescopes starting a few days after the estimated explosion time of 2011 December 5 UT and up to 432 rest-frame days thereafter. The rising part of the light curve was monitored only in the RPTF filter band, and maximum in this band was reached ∼30 rest-frame days after the estimated explosion time. The light curve and spectra of PTF11rka are consistent with the core-collapse explosion of a ∼10 M⊙ carbon–oxygen core evolved from a progenitor of main-sequence mass 25–40 M⊙, that liberated a kinetic energy Ek≈4 × 1051 erg, expelled ∼8 M⊙ of ejecta, and synthesized ∼0.5 M⊙ of 56Ni. The photospheric spectra of PTF11rka are characterized by narrow absorption lines that point to suppression of the highest ejecta velocities (≳ 15 000 km s−1). This would be expected if the ejecta impacted a dense, clumpy circumstellar medium. This in turn caused them to lose a fraction of their energy (∼5 × 1050 erg), less than 2 per cent of which was converted into radiation that sustained the light curve before maximum brightness. This is reminiscent of the superluminous SN 2007bi, the light-curve shape and spectra of which are very similar to those of PTF11rka, although the latter is a factor of 10 less luminous and evolves faster in time. PTF11rka is in fact more similar to gamma-ray burst SNe in luminosity, although it has a lower energy and a lower Ek/Mej ratio.

The role of health information technology in advancing care management and coordination in accountable care organizations

Background: To be successful, accountable care organizations (ACOs) must effectively manage patient care. Health information technology (HIT) can support care delivery by providing various degrees of coordination. Few studies have examined the role of HIT functionalities or the role of different levels of coordination enabled by HIT on care management processes. Purposes: We examine HIT functionalities in ACOs, categorized by the level of coordination they enable in terms of information and work flow, to determine which specific HIT functionalities and levels of coordination are most strongly associated with care management processes. Methodology/Approach: Retrospective cross-sectional analysis was done using 2012 data from the National Survey of Accountable Care Organizations. HIT functionalities are categorized into coordination levels: information capture, the lowest level, which coordinates through standardization; information provision, which supports unidirectional activities; and information exchange, which reflects the highest level of coordination allowing for bidirectional exchange. The Care Management Process index (CMP index) includes 13 questions about the extent to which care is planned, monitored, and supported by providers and patients. Multiple regressions adjusting for organizational and ACO contractual factors are used to assess relationships between HIT functionalities and the CMP index. Findings: HIT functionality coordinating the most complex interdependences (information exchange) was associated with a 0.41 standard deviation change in the CMP index (β = .41, p < .001), but the associations for information capture (β = −.01, p = .97) and information provision (β = .15, p = .48) functionalities were not significant. Implications: The current study has shed some light on the relationship between HIT and care management processes by specifying the coordination roles that HIT may play and, in particular, the importance of information exchange functionalities. Although these represent early findings, further research can help policy makers and clinical leaders understand how to prioritize HIT development given resource constraints.

Enantioselective Allylation of Aromatic Amines after In Situ Generation of an Activated Cyclometalated Iridium Catalyst

Highly regio- and enantioselective allylation of aromatic amines is observed when a cyclometalated Ir–phosphoramidite complex is generated in situ (see scheme). The active catalyst can be formed from [{Ir(cod)Cl}2] and ligand L with a volatile alkylamine prior to addition of the reagents or upon use of a tertiary amine additive.

Adoptive Treg Cell Therapy in a Patient With Systemic Lupus Erythematosus

Objective Adoptive Treg cell therapy has great potential to treat autoimmune disease. Currently, very little is known about how these cells impact inflamed tissues. This study was undertaken to elucidate how autologous Treg cell therapy influences tissue inflammation in human autoimmune disease. Methods We describe a systemic lupus erythematosus (SLE) patient with active skin disease who received adoptive Treg therapy. We comprehensively quantified Treg cells and immune activation in peripheral blood and skin, with data obtained at multiple time points posttreatment. Results Deuterium tracking of infused Treg cells revealed the transient presence of cells in peripheral blood, accompanied by increased percentages of highly activated Treg cells in diseased skin. Flow cytometric analysis and whole transcriptome RNA sequencing revealed that Treg cell accumulation in skin was associated with a marked attenuation of the interferon‐γ pathway and a reciprocal augmentation of the interleukin‐17 (IL‐17) pathway. This phenomenon was more pronounced in skin relative to peripheral blood. To validate these findings, we investigated Treg cell adoptive transfer of skin inflammation in a murine model and found that it also resulted in a pronounced skewing away from Th1 immunity and toward IL‐17 production. Conclusion We report the first case of a patient with SLE treated with autologous adoptive Treg cell therapy. Taken together, our results suggest that this treatment leads to increased activated Treg cells in inflamed skin, with a dynamic shift from Th1 to Th17 responses.

Stressful life events and EEG sleep in depressed and normal control adolescents

EEG sleep measures in 35 depressed and 33 normal control adolescents were examined in relation to stressful life events occurring in the year before sleep studies. There was a significant interaction between stressful life events and diagnostic status for REM latency and total REM time. In the normal controls, the presence of stressful life events was significantly associated with reduced REM latency and increased total REM time. Among the depressed adolescents, there were no significant effects of stressful life events on REM latency or total REM time. The depressed adolescents with no stressful life events (n = 9) had significantly lower REM latency values compared to normal control adolescents with no stressful life events (n = 13)(61.7 +/- 50.0 vs. 132.1 +/- 79.0, p < or = .01). It appears that stressful life events influence at least some measures of adolescent sleep and should be considered in future controlled studies aimed at understanding sleep changes in adolescent depression.

ChemInform Abstract: Dendritic Fullerenes; a New Approach to Polymer Modification of C60.

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

⁶⁵Cu NMR Spectroscopy of Cu-Exchanged ZSM-5 Catalysts

65Cu NMR and 65Cu−27Al spin-echo, double-resonance (SEDOR) measurements from Cu-exchanged ZSM-5 catalysts are reported. The presence of Cu+ cations in CuZSM-5 was detected directly by 65Cu NMR; upon heating, we observed the autoreduction of Cu2+ to Cu+. It was found that the Cu+ cations can be reduced further to Cu0 by exposure to carbon monoxide at high temperatures. The internuclear distance between the two quadrupolar nuclei Cu (spin-3/2) and Al (spin-5/2) was determined to be 0.23 ± 0.02 nm, in good agreement with the value of 0.24 nm obtained from density functional theory calculations.

Viscoelastic properties of high pressure and heat induced tofu gels

African American Grandparents Raising Grandchildren: A National Profile of Demographic and Health Characteristics

Social workers are seeing, in health care settings, an increasing number of grandparent caregivers among their clients. A disproportionate number of these are African American. This article compares the demographic and physical and mental health characteristics of African American grandparents who are raising their grandchildren with non-caregiving African American grandparents, using the National Survey of Families and Households (1992-94). Caregivers reported significantly higher levels of limitations in four of five activities of daily living (ADL) and were almost twice as likely as their peers to report clinically relevant levels of depression.

Recombinant DNA techniques for bioremediation and environmentally-friendly synthesis

CCDC 711272: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

CCDC 617125: Experimental Crystal Structure Determination

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Thermal history of the Ecstall, and Butedale plutons: 40Ar/39Ar thermochronology and thermal modeling

Asymmetries in Type II-Plateau Supernovae: A Comparative Spectropolarimetric Study

Restoration of irradiance-stressed Dunaliella salina (green alga) to physiological growth conditions: changes in antenna size and composition of Photosystem II

Constraints on Cosmological Models from [ITAL]Hubble Space Telescope[/ITAL] Observations of High-[CLC][ITAL]z[/ITAL][/CLC] Supernovae

We have coordinated Hubble Space Telescope (HST) photometry with ground-based discovery for three supernovae: Type Ia supernovae near z~0.5 (SN 1997ce, SN 1997cj) and a third event at z=0.97 (SN 1997ck). The superb spatial resolution of HST separates each supernova from its host galaxy and leads to good precision in the light curves. We use these light curves and relations between luminosity, light-curve shape, and color calibrated from low-z samples to derive relative luminosity distances that are accurate to 10% at z~0.5 and 20% at z=1. When the HST sample is combined with the distance to SN 1995K (z=0.48), analyzed by the same precepts, we find that matter alone is insufficient to produce a flat universe. Specifically, for Ωm+ΩΛ=1, Ωm is less than 1 with more than 95% confidence, and our best estimate of Ωm is -0.1+/-0.5 if ΩΛ=0. Although this result is based on a very small sample whose systematics remain to be explored, it demonstrates the power of HST measurements for high-redshift supernovae.

A Density Functional Theory Study of the Interactions of H₂O with H−ZSM-5, Cu−ZSM-5, and Co−ZSM-5

The interactions of water with H−ZSM-5, Cu−ZSM-5, and Co−ZSM-5 have been investigated by density functional theory (DFT). Calculations were also performed to determine the thermodynamics of metal removal from the zeolite. For all three forms of ZSM-5, water adsorbs by direct interaction of the O atom with the cation and hydrogen bonding of one of the two H atoms with an oxygen atom in the zeolite framework. The magnitude of the energy of adsorption of one H2O molecule decreases in the order Cu−ZSM-5 (Cu as Cu+) > Co−ZSM-5 (Co as Co2+(OH)-) > H−ZSM-5 > Cu−ZSM-5 (Cu as Cu2+(OH)-). Adsorption of a second H2O molecule occurs with a smaller binding energy, which decreases in the order Cu−ZSM-5 (Cu as Cu+) > Cu−ZSM-5 (Cu as Cu2+(OH)-) > Co−ZSM-5 (Co as Co2+(OH)-) > H−ZSM-5. At 800 K, demetalation to form a gaseous metal hydroxide species is unfavorable thermodynamically but will occur spontaneously if the final product is a metal oxide. Demetalation of Cu is projected to occur much more readily than demetalation of Co, in good agreement with experimental observation.