Magnetic Field-Decay-Induced Electron Captures: a Strong Heat Source in Magnetar Crusts (2009)
Cooper, Randall L., Kaplan, David L.
We propose a new heating mechanism in magnetar crusts. Magnetars' crustal magnetic fields are much stronger than their surface fields; therefore, magnetic pressure partially supports the crust...
A Mid-Infrared Counterpart to the Magnetar 1E 2259+586 (2009)
Kaplan, David L., Chakrabarty, Deepto, Wang, Zhongxiang, Wachter, Stefanie
We report the discovery of a 4.5μm counterpart to the anomalous X-ray pulsar (magnetar) 1E 2259+586 with the Spitzer Space Telescope. The mid-infrared flux density is 6.3 ± 1.0μJy at 4.5μm and
A Mid-Infrared Counterpart to the Magnetar 1E 2259+586 (2009)
Kaplan, David L., Chakrabarty, Deepto, Wang, Zhongxiang, Wachter, Stefanie
We report the discovery of a 4.5 um counterpart to the anomalous X-ray pulsar (magnetar) 1E 2259+586 with the Spitzer Space Telescope. The mid-infrared flux density is 6.3+/-1.0 uJy at 4.5 um and
A variable near-infrared counterpart to the neutron-star low-mass X-ray binary 4U 1705-440 (2008)
Homan, Jeroen, Kaplan, David L., Berg, Maureen Van Den, Young, Andrew J.
We report the discovery of a near-infrared (nIR) counterpart to the persistent neutron-star low-mass X-ray binary 4U 1705-440, at a location consistent with its recently determined Chandra X-ray...
Harvard Medical School, Center for Technology & Engineering, (2008)
Helen H. Lu, Rebecca L. Horan, Tara Calabro, Daniel Ryder, David L. Kaplan, Peter Stark, ...
Research Division,
A Bursting Radio Transient in the Direction of the Galactic Center (2008)
Ray, Paul S., Hyman, Scott D., Lazio, T. Joseph, Kassim, Namir E., Roy, Subhashis, Kaplan, David L., ...
The radio sky is poorly sampled for rapidly varying transients because of the narrow field-of-view of most imaging radio telescopes at cm and shorter wavelengths. The emergence of sensitive long...
Magnetic hydrogen atmosphere models and the neutron star RX J1856.5–3754 (2008)
David L. Kaplan, Philip Chang, Matthew Van Adelsberg, Er Y. Potekhin
Seven candidate isolated, cooling neutron stars (INSs) have been identified by the ROSAT All-Sky Survey, of which the two brightest are RX J1856.5−3754 and RX J0720.4−3125 (see Treves et al.
Hartman, Jacob M., Patruno, Alessandro, Chakrabarty, Deepto, Kaplan, David L., Markwardt, Craig B., Morgan, Edward H., ...
We present a 7 yr timing study of the 2.5 ms X-ray pulsar SAX J1808.4-3658, an X-ray transient with a recurrence time of ~2 yr, using data from the Rossi X-ray Timing Explorer covering 4 transient...
Spectral and Rotational Changes in the Isolated Neutron Star RX J0720.4-3125 (2007)
Van Kerkwijk, Marten H., Kaplan, David L., Pavlov, George G., Mori, Kaya
RX J0720.4-3125 is an isolated neutron star that, uniquely in its class, has shown changes in its thermal X-ray spectrum. We use new spectra taken with Chandra's Low Energy Transmission Grating...
Magnetic Hydrogen Atmosphere Models and the Neutron Star RX J1856.5-3754 (2006)
Ho, Wynn C. G., Kaplan, David L., Chang, Philip, Van Adelsberg, Matthew, Potekhin, Alexander Y.
RX J1856.5-3754 is one of the brightest nearby isolated neutron stars, and considerable observational resources have been devoted to it. However, current models are unable to satisfactorily explain...
A Search for Fallback Disks in Four Young Supernova Remnants (2006)
Wang, Zhongxiang, Kaplan, David L., Chakrabarty, Deepto
We report on our search for the optical/infrared counterparts to the central compact objects in four young supernova remnants: Pup A, PKS 1209-52, RCW 103, and Cas A. The X-ray point sources in these...
A search for a counterpart of the unidentified gamma-ray source 3EG J2020+4017 (2CG078+2) (2006)
Weisskopf, Martin C., Swartz, Douglas A., Carraminana, Alberto, Carrasco, Luis, Kaplan, David L., Becker, Werner, ...
We report observations with the Chandra X-ray Observatory of a field in the gamma$-Cygni supernova remnant (SNR78.2+2.1) centered on the cataloged location of the unidentified, bright gamma-ray...
A Debris Disk Around An Isolated Young Neutron Star (2006)
Wang, Zhongxiang, Chakrabarty, Deepto, Kaplan, David L.
Pulsars are rotating, magnetized neutron stars that are born in supernova explosions following the collapse of the cores of massive stars. If some of the explosion ejecta fails to escape, it may fall...
O'Meara, John M., Chen, Hsiao-Wen, Kaplan, David L.
We present initial results from a Magellan telescope program to image galaxies that give rise to damped Lyman absorbers (DLAs) at 1.63 < z_DLA < 2.37. Our program differs from previous efforts in...
Formation and Characterization of Langmuir Silk Films (2006)
Muller, Wayne S., Samuelson, Lynne A., Fossey, Stephen A., Kaplan, David L.
Langmuir films were formed from regenerated (solubilized cocoons) Bombyx mori silk. Pressure/area isotherms and deposition studies indicate the formation of stable films; however, due to the...
A search for the X-ray counterpart of the unidentified γ-ray source 3EG J2020+4017 (2CG078+2) (2006)
Weisskopf, Martin C., Swartz, Douglas A., Carramiñana, Alberto, Carrasco, Luis, Kaplan, David L., Becker, Werner, ...
Krauss, Miriam I., Wang, Zhongxiang, Dullighan, Allyn, Juett, Adrienne M., Kaplan, David L., Chakrabarty, Deepto, ...
We report the precise optical and X-ray localization of the 3.2 ms accretion-powered X-ray pulsar XTE J1814-338 with data from the Chandra X-Ray Observatory as well as optical observations conducted...
Twenty-One Millisecond Pulsars in Terzan 5 Using the Green Bank Telescope (2005)
Ransom, Scott M., Hessels, Jason W. T., Stairs, Ingrid H., Freire, Paulo C. C., Camilo, Fernando, Kaspi, Victoria M., ...
We have discovered 21 millisecond pulsars (MSPs) in the globular cluster Terzan 5 using the Green Bank Telescope, bringing the total of known MSPs in Terzan 5 to 24. These discoveries confirm...
The Materials Biotechnology Symposium was held at the U.S. Army Natick Research. The Symposium sessions included were: structure/function relationships for proteins, polysaccharides, and lipids;...
Surface organization and nanopatterning of collagen by dip-pen nanolithography
Wilson, Donna L., Martin, Raquel, Hong, Seunghun, Cronin-Golomb, Mark, Mirkin, Chad A., Kaplan, David L.
Collagen is a key fibrous protein in biological systems, characterized by a complex structural hierarchy as well as the ability to self-assemble into liquid crystalline mesophases. The structural...
Biosynthesis of Novel Exopolymers by Aureobasidium pullulans
Lee, Jin W., Yeomans, Walter G., Allen, Alfred L., Deng, Fang, Gross, Richard A., Kaplan, David L.
Aureobasidium pullulans ATCC 42023 was cultured under aerobic conditions with glucose, mannose, and glucose analogs as energy sources. The exopolymer extracts produced under these conditions were...
Lee, Jin W., Deng, Fang, Yeomans, Walter G., Allen, Alfred L., Gross, Richard A., Kaplan, David L.
Gluconacetobacter xylinus (=Acetobacter xylinum) ATCC 10245 incorporated 2-amino-2-deoxy-d-glucose (glucosamine) and 2-acetamido-2-deoxy-d-glucose (N-acetylglucosamine), but not 3-O-methyl-d-glucose...
Biodegradation of Glycidol and Glycidyl Nitrate †
Kaplan, David L., Cornell, John H., Kaplan, Arthur M.
When calcium hydroxide is used to desensitize glycerol trinitrate (nitroglycerine)-containing waste streams, the epoxides glycidol and glycidyl nitrate are formed. The epoxide rings of both compounds...
Biodegradation of N-Nitrosodimethylamine in Aqueous and Soil Systems
Kaplan, David L., Kaplan, Arthur M.
N-Nitrosodimethylamine (NDMA) was mineralized by microorganisms in aqueous and soil systems. Initial rates of mineralization (micrograms per milliliter per day) were calculated for a wide range of...
Surface organization and nanopatterning of collagen by dip-pen nanolithography
Wilson, Donna L., Martin, Raquel, Hong, Seunghun, Cronin-Golomb, Mark, Mirkin, Chad A., Kaplan, David L.
Collagen is a key fibrous protein in biological systems, characterized by a complex structural hierarchy as well as the ability to self-assemble into liquid crystalline mesophases. The structural...
Biosynthesis of Novel Exopolymers by Aureobasidium pullulans
Lee, Jin W., Yeomans, Walter G., Allen, Alfred L., Deng, Fang, Gross, Richard A., Kaplan, David L.
Aureobasidium pullulans ATCC 42023 was cultured under aerobic conditions with glucose, mannose, and glucose analogs as energy sources. The exopolymer extracts produced under these conditions were...
Lee, Jin W., Deng, Fang, Yeomans, Walter G., Allen, Alfred L., Gross, Richard A., Kaplan, David L.
Gluconacetobacter xylinus (=Acetobacter xylinum) ATCC 10245 incorporated 2-amino-2-deoxy-d-glucose (glucosamine) and 2-acetamido-2-deoxy-d-glucose (N-acetylglucosamine), but not 3-O-methyl-d-glucose...
Biodegradation of Glycidol and Glycidyl Nitrate †
Kaplan, David L., Cornell, John H., Kaplan, Arthur M.
When calcium hydroxide is used to desensitize glycerol trinitrate (nitroglycerine)-containing waste streams, the epoxides glycidol and glycidyl nitrate are formed. The epoxide rings of both compounds...
Biodegradation of N-Nitrosodimethylamine in Aqueous and Soil Systems
Kaplan, David L., Kaplan, Arthur M.
N-Nitrosodimethylamine (NDMA) was mineralized by microorganisms in aqueous and soil systems. Initial rates of mineralization (micrograms per milliliter per day) were calculated for a wide range of...
Novel nanocomposites from spider silk–silica fusion (chimeric) proteins
Wong Po Foo, Cheryl, Patwardhan, Siddharth V., Belton, David J., Kitchel, Brandon, Anastasiades, Daphne, Huang, Jia, ...
Silica skeletal architectures in diatoms are characterized by remarkable morphological and nanostructural details. Silk proteins from spiders and silkworms form strong and intricate self-assembling...
Silk: molecular organization and control of assembly.
Valluzzi, Regina, Winkler, Stefan, Wilson, Donna, Kaplan, David L
The interface between the science and engineering of biology and materials is an area of growing interest. One of the goals of this field is to utilize biological synthesis and processing of polymers...
Protein Engineering of Wzc To Generate New Emulsan Analogs▿
Dams-Kozlowska, Hanna, Kaplan, David L.
Acinetobacter venetianus Rag1 produces an extracellular, polymeric lipoheteropolysaccharide termed apoemulsan. This polymer is putatively produced via a Wzy-dependent pathway. According to this...