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1. A 5deg x 5deg deep HI survey of the M81 group: II. HI distribution and kinematics of IC 2574 and HIJASS J1021+68

Author

Sorgho, A., Chemin, L., Kam, Z. S., Foster, T., and Carignan, C.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

We analyse the eastern region of a $5^\circ\times5^\circ$ deep HI survey of the M81 group containing the dwarf galaxy IC 2574 and the HI complex HIJASS J1021+68, located between the dwarf and the M81 system. The data show that IC 2574 has an extended HI envelope that connects to HIJASS J1021+68 in the form of a collection of small clouds, but no evident connection has been found between IC 2574 and the central members of the M81 group. We argue, based on the morphology of the clouds forming HIJASS J1021+68 and its velocity distribution, that the complex is not a dark galaxy as previously suggested, but is instead a complex of clouds either stripped from, or falling onto the primordial HI envelope of IC 2574. We also use the deep HI observations to map the extended HI envelope around IC 2574 and, using a 3D tilted-ring model, we derive the rotation curve of the galaxy to a larger extent than has been done before. Combining the obtained rotation curve to higher resolution curves from the literature, we constrain the galaxy's dark matter halo parameters., Comment: 15 pages, 17 figures. Accepted for publication in MNRAS

Published
2020
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2. SIGNALS: I. Survey Description

Author

Rousseau-Nepton, L., Martin, R. P., Robert, C., Drissen, L., Amram, P., Prunet, S., Martin, T., Moumen, I., Adamo, A., Alarie, A., Barmby, P., Boselli, A., Bresolin, F., Bureau, M., Chemin, L., Fernandes, R. C., Combes, F., Crowder, C., Della Bruna, L., Egusa, F., Epinat, B., Ksoll, V. F., Girard, M., Llanos, V. Gómez, Gouliermis, D., Grasha, K., Higgs, C., Hlavacek-Larrondo, J., Ho, I. -T., Iglesias-Páramo, J., Joncas, G., Kam, Z. S., Karera, P., Kennicutt, R. C., Klessen, R. S., Lianou, S., Liu, L., Liu, Q., de Amorim, A. Luiz, Lyman, J. D., Martel, H., Mazzilli-Ciraulo, B., McLeod, A. F., Melchior, A-L., Millan, I., Mollá, M., Momose, R., Morisset, C., Pan, H. -A., Pati, A. K., Pellerin, A., Pellegrini, E., Pérez, I., Petric, A., Plana, H., Rahner, D., Lara, T. Ruiz, Sánchez-Menguiano, L., Spekkens, K., Stasińska, G., Takamiya, M., Asari, N. Vale, and Vílchez, J. M.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

SIGNALS, the Star formation, Ionized Gas, and Nebular Abundances Legacy Survey, is a large observing program designed to investigate massive star formation and HII regions in a sample of local extended galaxies. The program will use the imaging Fourier transform spectrograph SITELLE at the Canada-France-Hawaii Telescope. Over 355 hours (54.7 nights) have been allocated beginning in fall 2018 for eight consecutive semesters. Once completed, SIGNALS will provide a statistically reliable laboratory to investigate massive star formation, including over 50 000 resolved HII regions : the largest, most complete, and homogeneous database of spectroscopically and spatially resolved extragalactic HII regions ever assembled. For each field observed, three datacubes covering the spectral bands of the filters SN1 (363 -386 nm), SN2 (482 - 513 nm), and SN3 (647 - 685 nm) are gathered. The spectral resolution selected for each spectral band is 1000, 1000, and 5000, respectively. As defined, the project sample will facilitate the study of small-scale nebular physics and many other phenomena linked to star formation at a mean spatial resolution of 20 pc. This survey also has considerable legacy value for additional topics including planetary nebulae, diffuse ionized gas, andsupernova remnants. The purpose of this paper is to present a general outlook of the survey, notably the observing strategy, galaxy sample, and science requirements., Comment: 19 pages, 14 figures, submitted to MNRAS

Published
2019
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5. Entropy Regularized Deconvolution of Cellular Cryo-Transmission Electron Tomograms

Author

John W. Sedat, David A. Agard, Muthuvel Arigovindan, Michael Elbaum, Kam Z, Croxford M, and Elizabeth Villa

Subjects
Physics, symbols.namesake, Transmission (telecommunications), Fourier analysis, Transmission electron microscopy, Resolution (electron density), symbols, macromolecular substances, Tomography, Electron, Deconvolution, Entropy (energy dispersal), Computational physics
Abstract

Cryo-electron tomography (cryo-ET) allows for the high resolution visualization of biological macromolecules. However, the technique is limited by a low signal-to-noise ratio (SNR) and variance in contrast at different frequencies, as well as reduced Z resolution. Here, we applied entropy regularized deconvolution (ER DC) to cryo-electron tomography data generated from transmission electron microscopy (TEM) and reconstructed using weighted back projection (WBP). We applied DC to several in situ cryo-ET data sets, and assess the results by Fourier analysis and subtomogram analysis (STA).

Published
2021

15. SIGNALS: I. Survey description

Author

Rousseau-Nepton, L, primary, Martin, R P, additional, Robert, C, additional, Drissen, L, additional, Amram, P, additional, Prunet, S, additional, Martin, T, additional, Moumen, I, additional, Adamo, A, additional, Alarie, A, additional, Barmby, P, additional, Boselli, A, additional, Bresolin, F, additional, Bureau, M, additional, Chemin, L, additional, Fernandes, R C, additional, Combes, F, additional, Crowder, C, additional, Della Bruna, L, additional, Duarte Puertas, S, additional, Egusa, F, additional, Epinat, B, additional, Ksoll, V F, additional, Girard, M, additional, Gómez Llanos, V, additional, Gouliermis, D, additional, Grasha, K, additional, Higgs, C, additional, Hlavacek-Larrondo, J, additional, Ho, I-T, additional, Iglesias-Páramo, J, additional, Joncas, G, additional, Kam, Z S, additional, Karera, P, additional, Kennicutt, R C, additional, Klessen, R S, additional, Lianou, S, additional, Liu, L, additional, Liu, Q, additional, de Amorim, A Luiz, additional, Lyman, J D, additional, Martel, H, additional, Mazzilli-Ciraulo, B, additional, McLeod, A F, additional, Melchior, A-L, additional, Millan, I, additional, Mollá, M, additional, Momose, R, additional, Morisset, C, additional, Pan, H-A, additional, Pati, A K, additional, Pellerin, A, additional, Pellegrini, E, additional, Pérez, I, additional, Petric, A, additional, Plana, H, additional, Rahner, D, additional, Ruiz Lara, T, additional, Sánchez-Menguiano, L, additional, Spekkens, K, additional, Stasińska, G, additional, Takamiya, M, additional, Vale Asari, N, additional, and Vílchez, J M, additional

Published
2019
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19. An open data ecosystem for cell migration research

Author

Masuzzo, P., Martens, L., Ampe, C., Anderson, K.I., Barry, J., Wever, O. De, Debeir, O., Decaestecker, C., Dolznig, H., Friedl, P.H.A., Gaggioli, C., Geiger, B., Goldberg, I.G., Horn, E., Horwitz, R., Kam, Z., Devedec, S.E. Le, Vignjevic, D.M., Moore, J., Olivo-Marin, J.C., Sahai, E., Sansone, S.A., Sanz-Moreno, V., Stromblad, S., Swedlow, J., Textor, J.C., Troys, M. Van, Zantl, R., Masuzzo, P., Martens, L., Ampe, C., Anderson, K.I., Barry, J., Wever, O. De, Debeir, O., Decaestecker, C., Dolznig, H., Friedl, P.H.A., Gaggioli, C., Geiger, B., Goldberg, I.G., Horn, E., Horwitz, R., Kam, Z., Devedec, S.E. Le, Vignjevic, D.M., Moore, J., Olivo-Marin, J.C., Sahai, E., Sansone, S.A., Sanz-Moreno, V., Stromblad, S., Swedlow, J., Textor, J.C., Troys, M. Van, and Zantl, R.

Abstract

Item does not contain fulltext, Cell migration research has recently become both a high content and a high throughput field thanks to technological, computational, and methodological advances. Simultaneously, however, urgent bioinformatics needs regarding data management, standardization, and dissemination have emerged. To address these concerns, we propose to establish an open data ecosystem for cell migration research.

Published
2015

21. Know (better) your neighbour: New HI structures in Messier 33 unveiled by a multiple peak analysis of high-resolution 21-cm data

Author

CHEMIN, L., CARIGNAN, C., FOSTER, T., KAM, Z. S., SSE 2012, Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux (L3AB), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB), Université de Bordeaux (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Bordeaux (UB), Département de Physique [Montréal], and Université de Montréal (UdeM)

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Galaxies: individual: M33, [PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], Galaxies: kinematics and dynamics, [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP], FOS: Physical sciences, NGC 598, Astrophysics - Astrophysics of Galaxies, Galaxies: ISM, Galaxies: structure, Astrophysics of Galaxies (astro-ph.GA), Local Group, Techniques: imaging spectroscopy, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

In our quest to constrain the dynamical and structural properties of Local Group spirals from high-quality interferometric data, we have performed a neutral hydrogen survey in the direction of Messier 33. Here we present a few preliminary results from the survey and show the benefits of fitting the HI spectra by multiple peaks on constraining the structure of the Messier 33 disk. In particular we report on the discovery of new inner spiral-like and outer annular structures overlaying with the well-known main HI disk of Messier 33. Possible origins of the additional outer annular structure are presented., 4 pages, 3 figures, proceedings of the 2012 French Astronomical and Astrophysical Society Conference. Editors: S. Boissier, P. de Laverny, N. Nardetto, R. Samadi, D. Valls-Gabaud and H. Wozniak

Published
2012

25. HI and Hα Mapping of M31 & M33

Author

Kam, Z. S., primary, Carignan, C., additional, Chemin, L., additional, Hernandez, O., additional, de Denus-Baillargeon, M., additional, and Djabo, Y., additional

Published
2010
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44. Laser scattering instrument for real time in-vivo measurement of ciliary activity in human fallopian tubes.

Author

Paltieli, Y, Weichselbaum, A, Hoffman, N, Eibschitz, I, and Kam, Z

Abstract

Based on a laser light scattering technique and fibre optic probe, we have developed and tested a simple and practical device for real time measurements of ciliary activity in human Fallopian tubes during laparoscopy and laparotomy. A further aim was to investigate the relationship between the ciliary beat frequency (CBF) and the morphology of the ciliary epithelium. The mean +/- SE of CBF in the fimbria and in the ampulla were 5.4 +/- 0.3 Hz and 5.0 +/- 0.1 Hz respectively. Small pieces of fimbria and ampulla epithelium were taken from the same sites at which the CBF was measured, and the percentage of ciliary cells was determined by scanning electron microscopy. A high positive correlation was found between CBF and the percentage of ciliary cells in the fimbria (r = 0.84) and in the ampulla (r = 0.88). The instrument presented in this study provided, for the first time, a quantitative examination of the CBF in intact human Fallopian tubes and may be used for the investigation of ciliary activity in patients with infertility. [ABSTRACT FROM AUTHOR]

Published
1995

46. Small-angle x-ray scattering study of halophilic malate dehydrogenase

Author

Kam Z, Eisenberg H, and Reich Mh

Subjects
Halobacterium, Electron density, Chemistry, Small-angle X-ray scattering, Scattering, X-Rays, Diffusion, Analytical chemistry, Biochemistry, Malate dehydrogenase, Solvation shell, Malate Dehydrogenase, Radius of gyration, Scattering, Radiation, Anisotropy, Mathematics
Abstract

Malate dehydrogenase from the organism Halobacterium marismortui was studied in solutions of varying salt concentration by using a small-angle X-ray system employing a linear position sensitive detector. Considerations pertaining to the study of absorbing multicomponent solutions are presented. The radius of gyration of halophilic malate dehydrogenase was found to be 31.8 +/- 0.6 A and the shape of the molecule spheroidal. The scattering from prolate ellipsoids of eccentricity between 1 and 2 best fitted the data while for oblate ellipsoids the scattering was best fitted for eccentricities between 1 and 0.5. No significant change in the radius of gyration or anisotropy of halophilic malate dehydrogenase was found in the range of NaCl concentrations studied (1-4 M). The contrast matching electron density was found to be 0.407 +/- 0.002 e/A3. A parallel study of bovine serum albumin yielded within experimental error a similar contrast matching electron density of 0.404 +/- 0.006 e/A3. This information combined with the diffusion coefficient and the amount of water and salt associated with halophilic malate dehydrogenase renders the existence of an outer hydration shell unlikely. The data are rather consistent at low resolution with a spheroidal particle of uniform electron density.

Published
1982

48. c-Cbl/Sli-1 regulates endocytic sorting and ubiquitination of the epidermal growth factor receptor.

Author

Levkowitz, G, Waterman, H, Zamir, E, Kam, Z, Oved, S, Langdon, W Y, Beguinot, L, Geiger, B, and Yarden, Y

Abstract

Ligand-induced down-regulation of two growth factor receptors, EGF receptor (ErbB-1) and ErbB-3, correlates with differential ability to recruit c-Cbl, whose invertebrate orthologs are negative regulators of ErbB. We report that ligand-induced degradation of internalized ErbB-1, but not ErbB-3, is mediated by transient mobilization of a minor fraction of c-Cbl into ErbB-1-containing endosomes. This recruitment depends on the receptor's tyrosine kinase activity and an intact carboxy-terminal region. The alternative fate is recycling of internalized ErbBs to the cell surface. Cbl-mediated receptor sorting involves covalent attachment of ubiquitin molecules, and subsequent lysosomal and proteasomal degradation. The oncogenic viral form of Cbl inhibits down-regulation by shunting endocytosed receptors to the recycling pathway. These results reveal an endosomal sorting machinery capable of controlling the fate, and, hence, signaling potency, of growth factor receptors.

Published
1998

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