Results 51 to 60 of about 3,849,349 (342)

Linking Stellar Populations to H ii Regions across Nearby Galaxies. II. Infrared Reprocessed and UV Direct Radiation Pressure in H ii Regions

The Astrophysical Journal
Radiation pressure is a key mechanism by which stellar feedback disrupts molecular clouds and drives H ii region expansion. This includes direct radiation pressure exerted by UV photons on dust grains, pressure associated with photoionization, and ...
Debosmita Pathak, Adam K. Leroy, Todd A. Thompson, Laura A. Lopez, Ashley. T. Barnes, Daniel A. Dale, Ian Blackstone, Simon C. O. Glover, Shyam H. Menon, Jessica Sutter, Thomas G. Williams, Dalya Baron, Francesco Belfiore, Frank Bigiel, Alberto D. Bolatto, Médéric Boquien, Rupali Chandar, Mélanie Chevance, Ryan Chown, Kathryn Grasha, Brent Groves, Ralf S. Klessen, Kathryn Kreckel, Jing Li, J. Eduardo Méndez-Delgado, Erik Rosolowsky, Karin Sandstrom, Sumit K. Sarbadhicary, Jiayi Sun, Leonardo Úbeda   +29 more
doaj   +1 more source

Mapping the evolution of mitochondrial complex I through structural variation

FEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin, Tingting Chen, James A. Letts   +2 more
wiley   +1 more source

Thermodynamics of the H ii Region Sh2-158 and “Direct” Measurement of Its Turbulence

The Astrophysical Journal
Three SITELLE hyperspectral cubes were used to obtain 12 million spectra sampling 11 emission lines of the H ii region Sh2-158. This data set enables the calculation of numerous diagnostics and physical parameters such as abundance, electronic density ...
Maxime Royer, Gilles Joncas, Mathieu Marquis   +2 more
doaj   +1 more source

Ionization Corrections For Low-Metallicity H II Regions and the Primordial Helium Abundance

, 1999
Helium and hydrogen recombination lines observed in low-metallicity, extragalactic H II regions provide the data used to infer the primordial helium mass fraction, Y_P.
Cid-Fernandes R., Gary Steigman, Levshakov S. A., Lopez R., Pagel B. E. J., Peimbert M., Peimbert M., Peimbert M., Peimbert M., Ruth Gruenwald, Stasinska G., Stasinska G., Sueli M. Viegas, Vilchez J. M.   +13 more
core   +3 more sources

WHAM Observations of H-Alpha, [S II], and [N II] toward the Orion and Perseus Arms: Probing the Physical Conditions of the Warm Ionized Medium [PDF]

, 1999
A large portion of the Galaxy (l = 123 deg to 164 deg, b = -6 deg to -35 deg), which samples regions of the Local (Orion) spiral arm and the more distant Perseus arm, has been mapped with the Wisconsin H-Alpha Mapper (WHAM) in the H-Alpha, [S II] 6716 ...
Golla G., L. M. Haffner, Otte B., Percival J. W., R. J. Reynolds, Reynolds R. J., Reynolds R. J., S. L. Tufte   +7 more
core   +4 more sources

Plasmodium falciparum gametogenesis essential protein 1 (GEP1) is a transmission‐blocking target

FEBS Letters, EarlyView.
This study shows Plasmodium falciparum GEP1 is vital for activating sexual stages of malarial parasites even independently of a mosquito factor. Knockout parasites completely fail gamete formation even when a phosphodiesterase inhibitor is added. Two single‐nucleotide polymorphisms (V241L and S263P) are found in 12%–20% of field samples.
Frederik Huppertz, Milagros Siebeck Caturelli, Lina S. Lehmann, Florian Kurth, Alexander G. Maier, Kai Matuschewski   +5 more
wiley   +1 more source

Signatures of inflow motion in cores of massive star formation: Potential collapse candidates

, 2007
Using the IRAM 30 m telescope, a mapping survey in optically thick and thin lines was performed towards 46 high mass star-forming regions. The sample includes UC H{\sc ii} precursors and UC H{\sc ii} regions.
Brand J., Christian Henkel, Hatchell J., Martin Miller, Molinari S., Rui Xue, Tieftrunk A. R., Xin Guan, Yuefang Wu   +8 more
core   +1 more source

4‐nitrobenzoate inhibits 4‐hydroxybenzoate polyprenyltransferase in malaria parasites and enhances atovaquone efficacy

FEBS Letters, EarlyView.
Atovaquone is an antimalarial requiring potentiation for sufficient efficacy. We pursued strategies to enhance its activity, showing that 4‐nitrobenzoate inhibits 4‐hydroxybenzoate polyprenyltransferase, decreasing ubiquinone biosynthesis. Since atovaquone competes with ubiquinol in mitochondria, 4‐nitrobenzoate facilitates its action, potentiating ...
Ignasi Bofill Verdaguer, Matheus Felipe Santos, Maurício Mazzine Filho, Gabriela Oliveira Castro, Agustín Hernández, Manoel Aparecido Peres, Alejandro Miguel Katzin, Marcell Crispim   +7 more
wiley   +1 more source

Spatially Resolved Galactic H ii Regions Observed by the LAMOST Medium-resolution Spectroscopic Survey of Nebulae (LAMOST MRS-N)

The Astronomical Journal
We present spatially resolved spectroscopic observations of 10 isolated Galactic H II regions using data from the LAMOST Medium-Resolution Spectroscopic Survey of Nebulae (LAMOST MRS-N).
Wei Zhang, Yunning Zhao, Lin Ma, Shiming Wen, Chaojian Wu, Juanjuan Ren, Jianjun Chen, Yuzhong Wu, Zhongrui Bai, Yonghui Hou, Yongheng Zhao, Hong Wu   +11 more
doaj   +1 more source

Observations of the Galaxy NGC 3077 in the Narrow-Band [S II] and Hα Filters

Open Astronomy, 2011
We present observations of the H I tidal arm near a dwarf galaxy NGC 3077 (member of the M81 galaxy group) in the narrow-band [S II] and Hα filters. Observations were carried out in 2011 March with the 2 m RCC telescope at the NAO Rozhen, Bulgaria.
Andjelić M., Stavrev K., Arbutina B., Ilić D., Urošević D.   +4 more
doaj   +1 more source