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Phillips I, Bieber RE, Dirks C, Grant KW, Brungart DS. Age Impacts Speech-in-Noise Recognition Differently for Nonnative and Native Listeners. J Speech Lang Hear Res 2024; 67:1602-1623. [PMID: 38569080 DOI: 10.1044/2024_jslhr-23-00470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/05/2024]
Abstract
PURPOSE The purpose of this study was to explore potential differences in suprathreshold auditory function among native and nonnative speakers of English as a function of age. METHOD Retrospective analyses were performed on three large data sets containing suprathreshold auditory tests completed by 5,572 participants who were self-identified native and nonnative speakers of English between the ages of 18-65 years, including a binaural tone detection test, a digit identification test, and a sentence recognition test. RESULTS The analyses show a significant interaction between increasing age and participant group on tests involving speech-based stimuli (digit strings, sentences) but not on the binaural tone detection test. For both speech tests, differences in speech recognition emerged between groups during early adulthood, and increasing age had a more negative impact on word recognition for nonnative compared to native participants. Age-related declines in performance were 2.9 times faster for digit strings and 3.3 times faster for sentences for nonnative participants compared to native participants. CONCLUSIONS This set of analyses extends the existing literature by examining interactions between aging and self-identified native English speaker status in several auditory domains in a cohort of adults spanning young adulthood through middle age. The finding that older nonnative English speakers in this age cohort may have greater-than-expected deficits on speech-in-noise perception may have clinical implications on how these individuals should be diagnosed and treated for hearing difficulties.
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Affiliation(s)
- Ian Phillips
- Audiology & Speech Pathology Center, Walter Reed National Military Medical Center, Bethesda, MD
- Henry M Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD
| | - Rebecca E Bieber
- Audiology & Speech Pathology Center, Walter Reed National Military Medical Center, Bethesda, MD
- Henry M Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD
| | - Coral Dirks
- Audiology & Speech Pathology Center, Walter Reed National Military Medical Center, Bethesda, MD
| | - Ken W Grant
- Audiology & Speech Pathology Center, Walter Reed National Military Medical Center, Bethesda, MD
| | - Douglas S Brungart
- Audiology & Speech Pathology Center, Walter Reed National Military Medical Center, Bethesda, MD
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Kulinski D, Carr W, Garfield BA, Salib J, Dirks C, Sheffield B, Brungart DS. Acute Hearing Deficits associated with Weapons Exposure in Section 734 Blast Overpressure Study (BOS). Mil Med 2023; 188:666-673. [PMID: 37948283 DOI: 10.1093/milmed/usad299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 07/05/2023] [Accepted: 08/04/2023] [Indexed: 11/12/2023] Open
Abstract
INTRODUCTION This prospective, multi-site, observational study describes ongoing efforts in support of the Fiscal Year 2018 National Defense Authorization Act (NDAA) Section 734 Blast Overpressure Study (BOS) to identify the acute effects impulse and blast exposure have on hearing abilities of the Warfighter in various military training environments. MATERIALS AND METHODS Hearing thresholds, a binaural tone detection task, and auditory symptoms were collected before and immediately following weapons exposure across nine military training environments from January 2020 to October 2022. An additional 25 non-exposed control participants also completed the behavioral test battery. A boothless audiometer was used to measure hearing ability in the field. Sound level meters were attached on-body to record the exposure environment throughout training. RESULTS Mean threshold change for the blast-exposed group was worse than the control group. Of the 188 blast-exposed participants, 23 experienced a temporary threshold shift (TTS) acutely after exposure. A decrease in binaural tone detection performance and increased symptom severity was found when comparing blast-exposed participants with a TTS versus those without a significant change in hearing. A complex but consistent relationship between measured exposure level (LAeq8hr) and the magnitude of the resulting TTS is suggested in the available data. CONCLUSIONS Recent discussions on Section 734 studies examining the effects of repetitive blast exposure have indicated that hearing-related issues were a critical problem that needed additional research. Study outcomes provide highly repeatable results across various weapons systems with hazardous blast exposure. This standardized set of hearing assessment tools for evaluating acute effects of noise under field conditions has been critically important in improving our understanding of TTS in prospective human subject research.
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Affiliation(s)
- Devon Kulinski
- National Military Audiology and Speech Center, Walter Reed National Military Medical Center, Bethesda, MD 20889, USA
| | - Walter Carr
- Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
| | - Bradley A Garfield
- Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
| | - Jonathan Salib
- Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA
| | - Coral Dirks
- National Military Audiology and Speech Center, Walter Reed National Military Medical Center, Bethesda, MD 20889, USA
| | - Benjamin Sheffield
- National Military Audiology and Speech Center, Walter Reed National Military Medical Center, Bethesda, MD 20889, USA
- Hearing Conservation and Readiness Branch, Army Public Health Center, Aberdeen Proving Ground, MD 21010, USA
| | - Douglas S Brungart
- National Military Audiology and Speech Center, Walter Reed National Military Medical Center, Bethesda, MD 20889, USA
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Kulinski D, Dirks C, Carr W, Sheffield B, Kamimori G, Brungart DS. Field assessment of acute auditory responses to environmental exposures in close quarters tactics training. Int J Audiol 2023; 62:138-150. [PMID: 35073491 DOI: 10.1080/14992027.2022.2028023] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
OBJECTIVE The purpose of this study was to evaluate auditory performance of military instructors as part of a training course involving noise and blast exposure. Boothless audiometry was used to estimate the test-retest reliability of the auditory measures under realistic field conditions and to determine risk of acute auditory injury during standard training practices. DESIGN AND STUDY SAMPLE Thirteen U.S. Marine instructors participated in study activities. An audiologic testing suite embedded in a noise-attenuating headset was used to test various tone detection tasks on subjects after exposure. Acoustic exposures were captured with sound level meters. RESULTS Boothless audiometry provide highly repeatable results for various tests of auditory performance in the field environment. In this test population, changes in auditory performance pre- and post-noise exposure were minimal for most measures. The notable exception was binaural (NoSπ) tone detection, which showed significant degradations both as a function of pre- and post-noise exposure on the same day and as a result of cumulative noise exposure over the period of the study. CONCLUSIONS Study outcomes are consistent with prior laboratory and epidemiological work and suggest a link between the binaural processes required for NoSπ detection and the hearing-related issues reported by blast-exposed service members.
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Affiliation(s)
- Devon Kulinski
- Audiology and Speech Center, Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Coral Dirks
- Audiology and Speech Center, Walter Reed National Military Medical Center, Bethesda, MD, USA
| | - Walter Carr
- Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Benjamin Sheffield
- Audiology and Speech Center, Walter Reed National Military Medical Center, Bethesda, MD, USA.,Army Hering Program, Army Public Health Center, Aberdeen Proving Ground, MD, USA
| | - Gary Kamimori
- Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD, USA
| | - Douglas S Brungart
- Audiology and Speech Center, Walter Reed National Military Medical Center, Bethesda, MD, USA
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Dirks C, Jansen A, Deppe M, Lohmann H. - Interaktion von Sprache und Gedächtnis bei Probanden mit typischer und atypischer Sprachdominanz. KLIN NEUROPHYSIOL 2011. [DOI: 10.1055/s-0031-1272792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Dirks C, Scholten B, Happel S, Zulauf A, Bombard A, Jungclas H. Characterisation of a Cu selective resin and its application to the production of 64Cu. J Radioanal Nucl Chem 2010. [DOI: 10.1007/s10967-010-0744-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
Different subgroups of feline leukemia virus (FeLV) use different host cell receptors for entry. Subgroup A FeLV (FeLV-A) is the virus that is transmitted from cat to cat, suggesting that cells expressing the FeLV-A receptor are important targets at the earliest stages of infection. FeLV-B evolves from FeLV-A in the infected cat through acquisition of cellular sequences that are related to the FeLV envelope gene. FeLV-Bs have been shown to infect cells using the Pit1 receptor, and some variants can infect cells at a lower efficiency using Pit2. Because these observations were made using receptor proteins of human or rodent origin, the role that Pit1 and Pit2 may play in FeLV-B replication in the cat is unclear. In this study, the feline Pit receptors were cloned and tested for their ability to act as receptors for different FeLV-Bs. Some FeLV-Bs infected cells expressing feline Pit2 and feline Pit1 with equal high efficiency. Variable region A (VRA) in the putative receptor-binding domain (RBD) was a critical determinant for both feline Pit1 and feline Pit2 binding, although other domains in the RBD appear to influence how efficiently the FeLV-B surface unit can bind to feline Pit2 and promote entry via this receptor. An arginine residue at position 73 in VRA was found to be important for envelope binding to feline Pit2 but not feline Pit1. Interestingly, this arginine is not found in endogenous FeLV sequences or in recombinant viruses recovered from feline cells infected with FeLV-A. Thus, while FeLV-Bs that are able to use feline Pit2 can evolve by recombination with endogenous sequences, a subsequent point mutation during reverse transcription may be needed to generate a virus that can efficiently enter the cells using the feline Pit2 as its receptor. These studies suggest that cells expressing the feline Pit2 protein are likely to be targets for FeLV-B infection in the cat.
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Affiliation(s)
- M M Anderson
- Division of Human Biology, Fred Hutchinson Cancer Research Center, University of Washington, Seattle, 98109-1024, USA
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Dirks C, Miller AD. Many nonmammalian cells exhibit postentry blocks to transduction by gammaretroviruses pseudotyped with various viral envelopes, including vesicular stomatitis virus G glycoprotein. J Virol 2001; 75:6375-83. [PMID: 11413304 PMCID: PMC114360 DOI: 10.1128/jvi.75.14.6375-6383.2001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Previous studies have suggested that Moloney murine leukemia virus (MoMLV)-based vectors pseudotyped with the vesicular stomatitis virus G glycoprotein (VSV-G) have extensive ability to transduce nonmammalian cells. However, we have identified multiple cell lines from fish (FHM), mosquitoes (Mos-55), moths (Sf9 and High-5), flies (S2), and frogs (XPK2) that are not efficiently transduced by MoMLV-based vectors pseudotyped with many different viral envelope proteins, including VSV-G, while the same vectors are functional in these cells following transfection. A comparison of MoMLV-based vector transduction in mammalian and nonmammalian cells shows that the nonmammalian cells exhibit blocks at either entry, reverse transcription, or integration. Additionally, VSV-G-pseudotyped MoMLV-based vector transduction is attenuated in the zebrafish cell line ZF4 at entry and/or reverse transcription, whereas other transduction processes are unaffected. We show that the variation of transduction by MoMLV-based vectors in mammalian and nonmammalian cells is not due to differences in culture conditions or cell division rate but is likely the result of divergence in cellular factors required for retroviral transduction.
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Affiliation(s)
- C Dirks
- Molecular and Cellular Biology Program, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave. N, Seattle, WA 98109-1024, USA
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Zárate R, Dirks C, van der Heijden R, Verpoorte R. Terpenoid indole alkaloid profile changes in Catharanthus pusillus during development. Plant Sci 2001; 160:971-977. [PMID: 11297794 DOI: 10.1016/s0168-9452(01)00340-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The terpenoid indole alkaloid content of Catharanthus pusillus was investigated during development from young to old plants. Different plant organs were assessed showing that the new leaves were the main repository site with vindoline ( approximately 4.8 mg/g DW) and catharanthine ( approximately 2.2 mg/g DW) being the major metabolites with the highest yields at the second and third sampling time (51 and 70 days, respectively). The other samples analysed, from old, oldest and yellow leaves followed in accumulation levels. The roots and stems were the least accumulative organs, although for the case of tubotaiwine the root was the most important organ. It appeared that the alkaloid content changed coinciding with the different developmental stages of the plants, particularly at flowering and fruiting stages. Moreover, this species seems to constitute a precious source of the monomerics, vindoline and catharanthine, intermediates in the synthesis of the two important antitumor dimerics vincristine and vinblastine, which did not accumulate in this species.
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Affiliation(s)
- R Zárate
- Gorlaeus laboratories, Division of Pharmacognosy, Leiden/Amsterdam Center for Drug Research (LACDR), Leiden University, PO Box 9502, 2300 RA, Leiden, The Netherlands
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Abstract
We present an unusual case of Clostridium septicum brain infection in a 72-yr-old woman who had no underlying malignant disease. The infection spread from a localized sit to the CNS causing gas formation. The patient died rapidly.
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Affiliation(s)
- C Dirks
- Department of Internal Medicine, Odense University Hospital, Denmark
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Meyeringh H, Dirks C, Schöss P, Schimmelpfennig H. [Studies of the etiology of rhinitis atrophicans in swine. 2. Determination of capsular antigens of P. muldicoda cultures, isolated from pigs with rhinitis atrophicans]. Dtsch Tierarztl Wochenschr 1977; 84:266-8. [PMID: 330138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Dirks C, Schöss P, Schimmelpfennig H. [Etiology of rhinitis atrophicans in swine]. Dtsch Tierarztl Wochenschr 1973; 80:380-2 concl. [PMID: 4585450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Dirks C, Schöos P, Schimmelpfennig H. [Etiology of porcine atrophic rhinitis]. Dtsch Tierarztl Wochenschr 1973; 80:342-5 contd. [PMID: 4582074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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