We have derived a new broadband photometric metallicity calibration for stars on the lower main s... more We have derived a new broadband photometric metallicity calibration for stars on the lower main sequence. We find that M Dwarfs with that harbor giant planets are metal-rich compared to a volume-limited sample of low-mass stars in the Solar neighborhood, which is consistent with the planet-metallicity correlation observed around Sun-like stars. We are taking advantage of this correlation by conducting
We report the detection of a new large-mass planet orbiting around a K0 IV(V = 8.26) star which h... more We report the detection of a new large-mass planet orbiting around a K0 IV(V = 8.26) star which has a minimum mass Mpsin i = 10.70+/-0.50 MJup in a 696.0+/-2.6-day orbit. It was detected in precise radial velocity (RV) measurements from Subaru and Keck. The derived orbital parameters, based on a kappa2 which minimized by Downhill Simplex algorithm, suggests that
This program is for the research and development of advanced, solid-brush current collection syst... more This program is for the research and development of advanced, solid-brush current collection systems for application to innovative electrical machinery. The objectives of the program are to increase the useful lifetime, reduce the sliding contact losses and increase the operating current density of solid brushes operating to transfer current between moving portions of electrical machines. The advances in current collector
Most stars become white dwarfs after they have exhausted their nuclear fuel (the Sun will be one ... more Most stars become white dwarfs after they have exhausted their nuclear fuel (the Sun will be one such). Between one-quarter and one-half of white dwarfs have elements heavier than helium in their atmospheres, even though these elements ought to sink rapidly into the stellar interiors (unless they are occasionally replenished). The abundance ratios of heavy elements in the atmospheres of white dwarfs are similar to the ratios in rocky bodies in the Solar System. This fact, together with the existence of warm, dusty debris disks surrounding about four per cent of white dwarfs, suggests that rocky debris from the planetary systems of white-dwarf progenitors occasionally pollutes the atmospheres of the stars. The total accreted mass of this debris is sometimes comparable to the mass of large asteroids in the Solar System. However, rocky, disintegrating bodies around a white dwarf have not yet been observed. Here we report observations of a white dwarf--WD 1145+017--being transited by at least one, and probably several, disintegrating planetesimals, with periods ranging from 4.5 hours to 4.9 hours. The strongest transit signals occur every 4.5 hours and exhibit varying depths (blocking up to 40 per cent of the star's brightness) and asymmetric profiles, indicative of a small object with a cometary tail of dusty effluent material. The star has a dusty debris disk, and the star's spectrum shows prominent lines from heavy elements such as magnesium, aluminium, silicon, calcium, iron, and nickel. This system provides further evidence that the pollution of white dwarfs by heavy elements might originate from disrupted rocky bodies such as asteroids and minor planets.
Two new dibenz[b,f]oxepins, empetroxepins A and B (1 and 2), and seven known compounds (3-9) were... more Two new dibenz[b,f]oxepins, empetroxepins A and B (1 and 2), and seven known compounds (3-9) were isolated from an extract of the Canadian medicinal plant Empetrum nigrum that significantly inhibited the growth of Mycobacterium tuberculosis H37Ra. The structures of 1 and 2 were established through analysis of NMR and MS data. The antimycobacterial activity of the plant extract was attributed primarily to the presence of two chalcone derivatives (6 and 7) that exhibited selective antimycobacterial activity (IC50 values of 23.8 and 32.8 ÎĽM, respectively) in comparison to mammalian (HEK 293) cells (IC50 values of 109 and 249 ÎĽM, respectively).
We report precise Doppler measurements of two stars, obtained at Lick Observatory as part of our ... more We report precise Doppler measurements of two stars, obtained at Lick Observatory as part of our search for planets orbiting intermediate-mass sub- giants. Periodic variations in the radial velocities of both stars reveal the presence of substellar orbital companions. These two stars are notably mas- sive with stellar masses of 1.80 M⊙ and 1.64 M⊙, respectively, indicating that they are
Alnus incana, commonly known as the gray or speckled alder, is a medicinal plant used by some Can... more Alnus incana, commonly known as the gray or speckled alder, is a medicinal plant used by some Canadian First Nations to treat symptoms associated with tuberculosis. The aim of the study was to assess the anti-mycobacterial activity of an Alnus incana bark extract and to identify the active constituents of the extract. Methanolic extracts of the bark of A. incana were subjected to bioassay guided fractionation using Mycobacterium tuberculosis (H37Ra). The active constituents were identified by NMR and MS. Four pentacyclic lupane triterpenes were isolated and were identified as betulin, betulinic acid, betulone and lupenone. Betulin displayed a MIC of 12.5ÎĽg/mL and an IC50 of 2.4ÎĽg/mL against M. tuberculosis (H37Ra). Betulinic acid and betulone showed lower anti-mycobacterial activities with IC50 values of 84 and 57ÎĽg/mL respectively. Lupenone was inactive against M. tuberculosis (H37Ra). Betulin, betulinic acid and betulone were identified as the major anti-mycobacterial constituents...
A Cummins ISB 5.9 liter medium-duty engine with cooled EGR has been used to study an early extrus... more A Cummins ISB 5.9 liter medium-duty engine with cooled EGR has been used to study an early extrusion of an advanced ceramic uncatalyzed diesel particulate filter (DPF). Data for the advanced ceramic material (ACM) and an uncatalyzed cordierite filter of similar dimensions are ...
2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333), 2002
Abstract The introduction of adaptive multi-rate (AMR) speech coders in wireless standards, such ... more Abstract The introduction of adaptive multi-rate (AMR) speech coders in wireless standards, such as GSM, imposes new challenges for forward error correction (FEC) design. Traditional FEC techniques of providing unequal error protection (UEP) may not maximize ...
The objective of this document is to provide health care professionals with recommendations for g... more The objective of this document is to provide health care professionals with recommendations for genetic counseling and testing of individuals with a suspected or confirmed diagnosis of Fabry disease, with a family history of Fabry disease, and those identified as female carriers of Fabry disease. These recommendations are the opinions of a multicenter working group of genetic counselors, medical geneticists, and other health professionals with expertise in Fabry disease counseling, as well as an individual with Fabry disease who is a founder of a Fabry disease patient advocacy group in the United States. The recommendations are U.S. Preventive Task Force Class III, and they are based on clinical experience, a review of pertinent English-language articles, and reports of expert committees. This document reviews the genetics of Fabry disease, the indications for genetic testing and interpretation of results, psychosocial considerations, and references for professional and patient reso...
We have derived a new broadband photometric metallicity calibration for stars on the lower main s... more We have derived a new broadband photometric metallicity calibration for stars on the lower main sequence. We find that M Dwarfs with that harbor giant planets are metal-rich compared to a volume-limited sample of low-mass stars in the Solar neighborhood, which is consistent with the planet-metallicity correlation observed around Sun-like stars. We are taking advantage of this correlation by conducting
We report the detection of a new large-mass planet orbiting around a K0 IV(V = 8.26) star which h... more We report the detection of a new large-mass planet orbiting around a K0 IV(V = 8.26) star which has a minimum mass Mpsin i = 10.70+/-0.50 MJup in a 696.0+/-2.6-day orbit. It was detected in precise radial velocity (RV) measurements from Subaru and Keck. The derived orbital parameters, based on a kappa2 which minimized by Downhill Simplex algorithm, suggests that
This program is for the research and development of advanced, solid-brush current collection syst... more This program is for the research and development of advanced, solid-brush current collection systems for application to innovative electrical machinery. The objectives of the program are to increase the useful lifetime, reduce the sliding contact losses and increase the operating current density of solid brushes operating to transfer current between moving portions of electrical machines. The advances in current collector
Most stars become white dwarfs after they have exhausted their nuclear fuel (the Sun will be one ... more Most stars become white dwarfs after they have exhausted their nuclear fuel (the Sun will be one such). Between one-quarter and one-half of white dwarfs have elements heavier than helium in their atmospheres, even though these elements ought to sink rapidly into the stellar interiors (unless they are occasionally replenished). The abundance ratios of heavy elements in the atmospheres of white dwarfs are similar to the ratios in rocky bodies in the Solar System. This fact, together with the existence of warm, dusty debris disks surrounding about four per cent of white dwarfs, suggests that rocky debris from the planetary systems of white-dwarf progenitors occasionally pollutes the atmospheres of the stars. The total accreted mass of this debris is sometimes comparable to the mass of large asteroids in the Solar System. However, rocky, disintegrating bodies around a white dwarf have not yet been observed. Here we report observations of a white dwarf--WD 1145+017--being transited by at least one, and probably several, disintegrating planetesimals, with periods ranging from 4.5 hours to 4.9 hours. The strongest transit signals occur every 4.5 hours and exhibit varying depths (blocking up to 40 per cent of the star's brightness) and asymmetric profiles, indicative of a small object with a cometary tail of dusty effluent material. The star has a dusty debris disk, and the star's spectrum shows prominent lines from heavy elements such as magnesium, aluminium, silicon, calcium, iron, and nickel. This system provides further evidence that the pollution of white dwarfs by heavy elements might originate from disrupted rocky bodies such as asteroids and minor planets.
Two new dibenz[b,f]oxepins, empetroxepins A and B (1 and 2), and seven known compounds (3-9) were... more Two new dibenz[b,f]oxepins, empetroxepins A and B (1 and 2), and seven known compounds (3-9) were isolated from an extract of the Canadian medicinal plant Empetrum nigrum that significantly inhibited the growth of Mycobacterium tuberculosis H37Ra. The structures of 1 and 2 were established through analysis of NMR and MS data. The antimycobacterial activity of the plant extract was attributed primarily to the presence of two chalcone derivatives (6 and 7) that exhibited selective antimycobacterial activity (IC50 values of 23.8 and 32.8 ÎĽM, respectively) in comparison to mammalian (HEK 293) cells (IC50 values of 109 and 249 ÎĽM, respectively).
We report precise Doppler measurements of two stars, obtained at Lick Observatory as part of our ... more We report precise Doppler measurements of two stars, obtained at Lick Observatory as part of our search for planets orbiting intermediate-mass sub- giants. Periodic variations in the radial velocities of both stars reveal the presence of substellar orbital companions. These two stars are notably mas- sive with stellar masses of 1.80 M⊙ and 1.64 M⊙, respectively, indicating that they are
Alnus incana, commonly known as the gray or speckled alder, is a medicinal plant used by some Can... more Alnus incana, commonly known as the gray or speckled alder, is a medicinal plant used by some Canadian First Nations to treat symptoms associated with tuberculosis. The aim of the study was to assess the anti-mycobacterial activity of an Alnus incana bark extract and to identify the active constituents of the extract. Methanolic extracts of the bark of A. incana were subjected to bioassay guided fractionation using Mycobacterium tuberculosis (H37Ra). The active constituents were identified by NMR and MS. Four pentacyclic lupane triterpenes were isolated and were identified as betulin, betulinic acid, betulone and lupenone. Betulin displayed a MIC of 12.5ÎĽg/mL and an IC50 of 2.4ÎĽg/mL against M. tuberculosis (H37Ra). Betulinic acid and betulone showed lower anti-mycobacterial activities with IC50 values of 84 and 57ÎĽg/mL respectively. Lupenone was inactive against M. tuberculosis (H37Ra). Betulin, betulinic acid and betulone were identified as the major anti-mycobacterial constituents...
A Cummins ISB 5.9 liter medium-duty engine with cooled EGR has been used to study an early extrus... more A Cummins ISB 5.9 liter medium-duty engine with cooled EGR has been used to study an early extrusion of an advanced ceramic uncatalyzed diesel particulate filter (DPF). Data for the advanced ceramic material (ACM) and an uncatalyzed cordierite filter of similar dimensions are ...
2002 IEEE International Conference on Communications. Conference Proceedings. ICC 2002 (Cat. No.02CH37333), 2002
Abstract The introduction of adaptive multi-rate (AMR) speech coders in wireless standards, such ... more Abstract The introduction of adaptive multi-rate (AMR) speech coders in wireless standards, such as GSM, imposes new challenges for forward error correction (FEC) design. Traditional FEC techniques of providing unequal error protection (UEP) may not maximize ...
The objective of this document is to provide health care professionals with recommendations for g... more The objective of this document is to provide health care professionals with recommendations for genetic counseling and testing of individuals with a suspected or confirmed diagnosis of Fabry disease, with a family history of Fabry disease, and those identified as female carriers of Fabry disease. These recommendations are the opinions of a multicenter working group of genetic counselors, medical geneticists, and other health professionals with expertise in Fabry disease counseling, as well as an individual with Fabry disease who is a founder of a Fabry disease patient advocacy group in the United States. The recommendations are U.S. Preventive Task Force Class III, and they are based on clinical experience, a review of pertinent English-language articles, and reports of expert committees. This document reviews the genetics of Fabry disease, the indications for genetic testing and interpretation of results, psychosocial considerations, and references for professional and patient reso...
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Papers by John R Johnson