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29 records · Page 2
All sourcesNASA NTRSDOE OSTI
NASA NTRS1995

Preservation of auditory and vestibular function after surgical removal of bilateral vestibular schwannomas in a patient with neurofibromatosis type 2

The outcome of acoustic neuroma (vestibular schwannoma) surgery continues to improve rapidly. Advances can be attributed to several fields, but the most important contributions have arisen from the identification of the genes responsible for the dominant inheritance of neurofibromatosis types 1 (NF1) and 2 (NF2) and the development of magnetic resonance imaging with gadolinium enhancement for the early anatomic confirmation of the pathognomonic, bilateral vestibular schwannomas in NF2. These advances enable early diagnosis and treatment when the tumors are small in virtually all subjects at risk for NF2. The authors suggest that advising young NF2 patients to wait until complications develop, especially hearing loss, before diagnosing and operating for bilateral eighth nerve schwannomas may not always be in the best interest of the patient. To the authors' knowledge, this is the first reported case of preservation of both auditory and vestibular function in a patient after bilateral vestibular schwannoma excision.

Case Reports↗
DOE OSTI2020

Materials Data on W(NF2)3 by Materials Project

(WF6)2(N2)3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is zero-dimensional and consists of twelve ammonia molecules and four tungsten hexafluoride molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on V(NF2)3 by Materials Project

(VF6)2(N2)3 is alpha bismuth trifluoride structured and crystallizes in the cubic Fm-3m space group. The structure is zero-dimensional and consists of twelve ammonia molecules and four VF6 clusters. In each VF6 cluster, V5+ is bonded in an octahedral geometry to six equivalent F1- atoms. All V–F bond lengths are 1.82 Å. F1- is bonded in a single-bond geometry to one V5+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sc(NF2)3 by Materials Project

(ScNF5)2(N2)2F2 crystallizes in the triclinic P1 space group. The structure is zero-dimensional and consists of two ammonia molecules, one hydrofluoric acid molecule, and one ScNF5 cluster. In the ScNF5 cluster, Sc3+ is bonded in a 2-coordinate geometry to three F1- atoms. There are a spread of Sc–F bond distances ranging from 1.15–2.64 Å. N1+ is bonded in a water-like geometry to two F1- atoms. There is one shorter (1.37 Å) and one longer (1.56 Å) N–F bond length. There are five inequivalent F1- sites. In the first F1- site, F1- is bonded in a 2-coordinate geometry to one Sc3+ and one F1- atom. The F–F bond length is 1.75 Å. In the second F1- site, F1- is bonded in a distorted single-bond geometry to one N1+ and one F1- atom. In the third F1- site, F1- is bonded in a single-bond geometry to one N1+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one Sc3+ atom. In the fifth F1- site, F1- is bonded in a single-bond geometry to one Sc3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on GeH12(NF2)4 by Materials Project

(NH)2(NH4)2GeH2F8 crystallizes in the orthorhombic Pccn space group. The structure is zero-dimensional and consists of eight ammonia molecules, eight ammonium molecules, and four GeH2F8 clusters. In each GeH2F8 cluster, Ge4+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of Ge–F bond distances ranging from 1.80–1.91 Å. H1+ is bonded in a linear geometry to two F1- atoms. There is one shorter (0.99 Å) and one longer (1.46 Å) H–F bond length. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Ge4+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Ge4+ atom. In the third F1- site, F1- is bonded in a bent 120 degrees geometry to one Ge4+ and one H1+ atom. In the fourth F1- site, F1- is bonded in a single-bond geometry to one H1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on U(NF2)4 by Materials Project

UF6N2(NF)2 crystallizes in the monoclinic C2/c space group. The structure is zero-dimensional and consists of eight ammonia molecules, eight monofluoroamine molecules, and four uranium hexafluoride molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on Sn(NF2)4 by Materials Project

SnF6(FN2)2 crystallizes in the orthorhombic Pccn space group. The structure is zero-dimensional and consists of four tetrafluorostannane;dihydrofluoride molecules and eight FN2 clusters. In each FN2 cluster, there are two inequivalent N1+ sites. In the first N1+ site, N1+ is bonded in a bent 150 degrees geometry to one N1+ and one F1- atom. The N–N bond length is 1.11 Å. The N–F bond length is 1.94 Å. In the second N1+ site, N1+ is bonded in a single-bond geometry to one N1+ atom. F1- is bonded in a single-bond geometry to one N1+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on ScH8(NF2)3 by Materials Project

ScNF6(NH4)2 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional and consists of four ammonium molecules and one ScNF6 framework. In the ScNF6 framework, Sc3+ is bonded to six F1- atoms to form ScF6 octahedra that share corners with six equivalent NF6 octahedra. The corner-sharing octahedra tilt angles range from 28–35°. There are two shorter (2.03 Å) and four longer (2.04 Å) Sc–F bond lengths. N+1.67- is bonded to six F1- atoms to form NF6 octahedra that share corners with six equivalent ScF6 octahedra. The corner-sharing octahedra tilt angles range from 28–35°. There are a spread of N–F bond distances ranging from 2.73–2.85 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted single-bond geometry to one Sc3+ and one N+1.67- atom. In the second F1- site, F1- is bonded in a 1-coordinate geometry to one Sc3+ and one N+1.67- atom. In the third F1- site, F1- is bonded in a single-bond geometry to one Sc3+ and one N+1.67- atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on TiH12(NF2)4 by Materials Project

TiF6(N2H6F)2 crystallizes in the orthorhombic Pccn space group. The structure is two-dimensional and consists of four TiF6 clusters and two N2H6F sheets oriented in the (0, 0, 1) direction. In each TiF6 cluster, Ti4+ is bonded in an octahedral geometry to six F1- atoms. There is two shorter (1.88 Å) and four longer (1.90 Å) Ti–F bond length. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Ti4+ atom. In the second F1- site, F1- is bonded in a single-bond geometry to one Ti4+ atom. In the third F1- site, F1- is bonded in a distorted single-bond geometry to one Ti4+ atom. In each N2H6F sheet, there are two inequivalent N2- sites. In the first N2- site, N2- is bonded in a trigonal non-coplanar geometry to three H1+ atoms. There are a spread of N–H bond distances ranging from 1.05–1.07 Å. In the second N2- site, N2- is bonded in a trigonal non-coplanar geometry to three H1+ atoms. There is one shorter (1.05 Å) and two longer (1.06 Å) N–H bond length. There are six inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N2- and one F1- atom. The H–F bond length is 1.66 Å. In the second H1+ site, H1+ is bonded in a distorted linear geometry to one N2- and one F1- atom. The H–F bond length is 1.55 Å. In the third H1+ site, H1+ is bonded in a distorted single-bond geometry to one N2- and one F1- atom. The H–F bond length is 1.62 Å. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the fifth H1+ site, H1+ is bonded in a single-bond geometry to one N2- atom. In the sixth H1+ site, H1+ is bonded in a distorted single-bond geometry to one N2- and one F1- atom. The H–F bond length is 1.62 Å. F1- is bonded in a 4-coordinate geometry to four H1+ atoms.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on InH12(NF2)3 by Materials Project

(NH4)3InF6 crystallizes in the monoclinic P2_1/c space group. The structure is zero-dimensional and consists of eight ammonium molecules, two InF6 clusters, and two InH8(NF3)2 clusters. In each InF6 cluster, In3+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of In–F bond distances ranging from 2.10–2.14 Å. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a distorted single-bond geometry to one In3+ atom. In the second F1- site, F1- is bonded in a distorted single-bond geometry to one In3+ atom. In the third F1- site, F1- is bonded in a distorted single-bond geometry to one In3+ atom. In each InH8(NF3)2 cluster, In3+ is bonded in an octahedral geometry to six F1- atoms. There are a spread of In–F bond distances ranging from 2.08–2.15 Å. N3- is bonded in a tetrahedral geometry to four H1+ atoms. There is two shorter (1.04 Å) and two longer (1.05 Å) N–H bond length. There are four inequivalent H1+ sites. In the first H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the second H1+ site, H1+ is bonded in a single-bond geometry to one N3- and one F1- atom. The H–F bond length is 1.64 Å. In the third H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. In the fourth H1+ site, H1+ is bonded in a single-bond geometry to one N3- atom. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one In3+ atom. In the second F1- site, F1- is bonded in a distorted bent 120 degrees geometry to one In3+ and one H1+ atom. In the third F1- site, F1- is bonded in a distorted single-bond geometry to one In3+ atom.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on SbH2(NF2)3 by Materials Project

SbH2(NF2)3 crystallizes in the orthorhombic Pmc2_1 space group. The structure is three-dimensional. Sb5+ is bonded in a distorted octahedral geometry to six F1- atoms. There are a spread of Sb–F bond distances ranging from 1.95–2.59 Å. There are three inequivalent N+0.33- sites. In the first N+0.33- site, N+0.33- is bonded in a 2-coordinate geometry to two N+0.33- atoms. There is one shorter (1.27 Å) and one longer (1.37 Å) N–N bond length. In the second N+0.33- site, N+0.33- is bonded in a 4-coordinate geometry to two N+0.33- and two equivalent F1- atoms. The N–N bond length is 1.43 Å. Both N–F bond lengths are 2.43 Å. In the third N+0.33- site, N+0.33- is bonded in a distorted rectangular see-saw-like geometry to two N+0.33- and two equivalent F1- atoms. Both N–F bond lengths are 2.91 Å. H1+ is bonded in a linear geometry to two F1- atoms. There is one shorter (1.01 Å) and one longer (1.40 Å) H–F bond length. There are four inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one Sb5+, one N+0.33-, and one H1+ atom. In the second F1- site, F1- is bonded in a distorted linear geometry to one Sb5+ and one N+0.33- atom. In the third F1- site, F1- is bonded in a distorted L-shaped geometry to one Sb5+ and two equivalent H1+ atoms. In the fourth F1- site, F1- is bonded in a single-bond geometry to one Sb5+ atom.

36 MATERIALS SCIENCE↗