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Niphargus-Thiothrix associations may be widespread in sulphidic groundwater ecosystems: evidence from southeastern Romania. (2018)

Flot, Jean-François ; Bauermeister, Jan ; Brad, Traian ; [weitere]

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Publikationsdatum: 2021-04-25

Beschreibung: Niphargus is a speciose amphipod genus found in groundwater habitats across Europe. Three Niphargus species living in the sulphidic Frasassi caves in Italy harbour sulphur-oxidizing Thiothrix bacterial ectosymbionts. These three species are distantly related, implying that the ability to form ectosymbioses with Thiothrix may be common among Niphargus. Therefore, Niphargus-Thiothrix associations may also be found in sulphidic aquifers other than Frasassi. In this study, we examined this possibility by analysing niphargids of the genera Niphargus and Pontoniphargus collected from the partly sulphidic aquifers of the Southern Dobrogea region of Romania, which are accessible through springs, wells and Movile Cave. Molecular and morphological analyses revealed seven niphargid species in this region. Five of these species occurred occasionally or exclusively in sulphidic locations, whereas the remaining two were restricted to nonsulphidic areas. Thiothrix were detected by PCR on all seven Dobrogean niphargid species and observed using microscopy to be predominantly attached to their hosts' appendages. 16S rRNA gene sequences of the Thiothrix epibionts fell into two main clades, one of which (herein named T4) occurred solely on niphargids collected in sulphidic locations. The other Thiothrix clade was present on niphargids from both sulphidic and nonsulphidic areas and indistinguishable from the T3 ectosymbiont clade previously identified on Frasassi-dwelling Niphargus. Although niphargids from Frasassi and Southern Dobrogea are not closely related, the patterns of their association with Thiothrix are remarkably alike. The finding of similar Niphargus-Thiothrix associations in aquifers located 1200 km apart suggests that they may be widespread in European groundwater ecosystems.

Schlagwort(e): amphipods; ecology; sulphide; symbiosis; systematics; taxonomy ; 551 ; Amphipoda ; Animals ; DNA, Bacterial ; Ecosystem ; Groundwater ; Molecular Sequence Data ; Phylogeny ; RNA, Ribosomal, 16S ; Romania ; Sequence Analysis, DNA ; Sulfur ; Symbiosis ; Thiothrix

Sprache: Englisch , Englisch

Materialart: article , publishedVersion

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Positive-parity rotational band in ^{158} Tb (2015)

J. Zhong, H. L. Ma, S. P. Hu, X. G. Wu, H. B. Sun, G. S. Li, C. Y. He, Y. Zheng, C. B. Li, Q. M. Chen, H. W. Li, Y. H. Wu, and P. W. Luo

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): J. Zhong, H. L. Ma, S. P. Hu, X. G. Wu, H. B. Sun, G. S. Li, C. Y. He, Y. Zheng, C. B. Li, Q. M. Chen, H. W. Li, Y. H. Wu, and P. W. Luo Excited states of the odd-odd nucleus Tb 158 have been studied via the Sm 154 ( Li 7 , 3 n ) Tb 158 reaction at a beam energy of 27 MeV. The new level scheme of Tb 158 involving a positive parity rotational band is established up to excitation energy ∼ 2.3 MeV and spin ∼ 17 ℏ . By comparing with the rotational bands… [Phys. Rev. C 92, 024308] Published Mon Aug 10, 2015

Schlagwort(e): Nuclear Structure

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Thema: Physik

Publiziert von American Physical Society (APS)

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Lifetime measurement for the possible antimagnetic rotation band in ^{101} Pd (2015)

M. Sugawara, T. Hayakawa, M. Oshima, Y. Toh, A. Osa, M. Matsuda, T. Shizuma, Y. Hatsukawa, H. Kusakari, T. Morikawa, Z. G. Gan, and T. Czosnyka

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): M. Sugawara, T. Hayakawa, M. Oshima, Y. Toh, A. Osa, M. Matsuda, T. Shizuma, Y. Hatsukawa, H. Kusakari, T. Morikawa, Z. G. Gan, and T. Czosnyka Lifetime measurements were made for the ν h 11 / 2 band in Pd 101 , which had been interpreted as a possible antimagnetic rotation band based on the comparison of I − ω behavior with the calculation of a semiclassical particle-rotor model in our previous study. Doppler broadened line shapes were analyzed fo… [Phys. Rev. C 92, 024309] Published Mon Aug 10, 2015

Schlagwort(e): Nuclear Structure

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Thema: Physik

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Measurement of the ^{97} Mo(n,γ) reaction with the DANCE γ calorimeter array (2015)

C. L. Walker, M. Krtička, B. Baramsai, F. Bečvář, T. A. Bredeweg, A. Chyzh, R. C. Haight, M. Jandel, J. Kroll, G. E. Mitchell, J. M. O'Donnell, R. S. Rundberg, J. L. Ullmann, S. Valenta, and J. B. Wilhelmy

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): C. L. Walker, M. Krtička, B. Baramsai, F. Bečvář, T. A. Bredeweg, A. Chyzh, R. C. Haight, M. Jandel, J. Kroll, G. E. Mitchell, J. M. O'Donnell, R. S. Rundberg, J. L. Ullmann, S. Valenta, and J. B. Wilhelmy Spectra of γ rays following the Mo 97 ( n , γ ) reaction were measured as a function of incident neutron energy with the DANCE (Detector for Advanced Neutron Capture Experiments) array of 160 BaF 2 scintillation detectors at the Los Alamos Neutron Science Center using an enriched Mo 97 target. These spectra… [Phys. Rev. C 92, 014324] Published Wed Jul 29, 2015

Schlagwort(e): Nuclear Structure

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Thema: Physik

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Systematics of α-decay transitions to excited states (2015)

D. S. Delion and A. Dumitrescu

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): D. S. Delion and A. Dumitrescu We systematize the available experimental material concerning α -decay transitions to low-lying excited states in even-even and odd-mass emitters. We generalize our previous theoretical prediction concerning the linear dependence between hindrance factors and the excitation energy for transitions in … [Phys. Rev. C 92, 021303(R)] Published Tue Aug 04, 2015

Schlagwort(e): Nuclear Structure

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Thema: Physik

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Triplet energy differences and the low lying structure of ^{62} Ga (2015)

T. W. Henry et al.

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): T. W. Henry et al. Background: Triplet energy differences (TED) can be studied to yield information on isospin-non-conserving interactions in nuclei. Purpose: The systematic behavior of triplet energy differences (TED) of T = 1 , J π = 2 + states is examined. The A = 62 isobar is identified as having a TED value that deviates … [Phys. Rev. C 92, 024315] Published Thu Aug 20, 2015

Schlagwort(e): Nuclear Structure

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Thema: Physik

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Electric quadrupole and magnetic dipole moments of odd nuclei near the magic ones in a self-consistent approach (2015)

G. Co', V. De Donno, M. Anguiano, R. N. Bernard, and A. M. Lallena

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): G. Co', V. De Donno, M. Anguiano, R. N. Bernard, and A. M. Lallena We present a model which describes the properties of odd-even nuclei with one nucleon more, or less, with respect to the magic number. In addition to the effects related to the unpaired nucleon, we consider those produced by the excitation of the closed shell core. By using a single-particle basis g… [Phys. Rev. C 92, 024314] Published Thu Aug 20, 2015

Schlagwort(e): Nuclear Structure

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Thema: Physik

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Isoscalar response of ^{68} Ni to α-particle and deuteron probes (2015)

M. Vandebrouck et al.

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): M. Vandebrouck et al. Giant resonances are fundamental excitations of the entire atomic nucleus. This work reports the discovery of several collective isoscalar modes in the unstable neutron-rich nucleus 68 Ni. Such modes are sensitive to the bulk properties of nuclear matter, e.g., how easily nuclear matter can be compressed. The work uses a novel technique with an “active” gas target, in which target and detector are the same. Comparison with lighter nickel isotopes sheds light on how these collective excitations evolve with increasing proton-neutron asymmetry. The experience gained in this work suggests future improvements for the experimental technique. [Phys. Rev. C 92, 024316] Published Fri Aug 21, 2015

Schlagwort(e): Nuclear Structure

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Lifetime measurement for the 2_{1}^{+} state in ^{140} Sm and the onset of collectivity in neutron-deficient Sm isotopes (2015)

F. L. Bello Garrote, A. Görgen, J. Mierzejewski, C. Mihai, J. P. Delaroche, M. Girod, J. Libert, E. Sahin, J. Srebrny, T. Abraham, T. K. Eriksen, F. Giacoppo, T. W. Hagen, M. Kisielinski, M. Klintefjord, M. Komorowska, M. Kowalczyk, A. C. Larsen, T. Marchlewski, I. O. Mitu, S. Pascu, S. Siem, A. Stolarz, and T. G. Tornyi

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): F. L. Bello Garrote, A. Görgen, J. Mierzejewski, C. Mihai, J. P. Delaroche, M. Girod, J. Libert, E. Sahin, J. Srebrny, T. Abraham, T. K. Eriksen, F. Giacoppo, T. W. Hagen, M. Kisielinski, M. Klintefjord, M. Komorowska, M. Kowalczyk, A. C. Larsen, T. Marchlewski, I. O. Mitu, S. Pascu, S. Siem, A. Stolarz, and T. G. Tornyi Background: The chain of Sm isotopes exhibits a wide range of nuclear shapes and collective behavior. While the onset of deformation for N 〉 82 has been well studied both experimentally and theoretically, fundamental data is lacking for some Sm isotopes with N 〈 82 . Purpose: Electromagnetic transi… [Phys. Rev. C 92, 024317] Published Fri Aug 21, 2015

Schlagwort(e): Nuclear Structure

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Effects of electron screening on α-decay half-lives in different external environments (2015)

Niu Wan (万牛), Chang Xu (许昌), and Zhongzhou Ren (任中洲)

American Physical Society (APS)

In: Physical Review C

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Niu Wan (万牛), Chang Xu (许昌), and Zhongzhou Ren (任中洲) In this paper, the electron screening effects on α -decay half-lives are investigated in different external environments, including α decays in neutral atoms, in metal, and in extremely strong magnetic-field environments. Systematic calculations of α -decay half-lives are performed for α emitters with… [Phys. Rev. C 92, 024301] Published Mon Aug 03, 2015

Schlagwort(e): Nuclear Structure

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