"We can't carry the weight of the whole world": illness experiences among Peruvian older adults with symptoms of depression and anxiety

Background: Despite the high levels of depression and anxiety symptoms in old age, the use of mental health services in this population is low. Help-seeking behaviors are shaped by how an individual perceives and experiences their illness. The objective of this study was to characterize the illness experiences of Peruvian older adults with depression and anxiety symptoms in order to lay the foundation for tailored community-based mental health interventions. Methods: In this qualitative study, we conducted in-depth interviews with a purposively selected sample of older adults (≥ 60 years) from peri-urban areas of Lima, Peru. We included individuals with only depressive symptoms (Patient Health Questionnaire-9 ≥ 10), only anxiety symptoms (Beck Anxiety Inventory ≥ 16), with depressive and anxiety symptoms, and older adults who mentioned they had received mental health treatment/care. The interview guide included the following topics: perceptions and experiences about depression and anxiety; perceptions about the relationship between physical chronic diseases and mental health; experiences with mental health professionals and treatments, and coping mechanisms. Data collection was conducted between October 2018 and February 2019. Results: We interviewed 38 participants (23 women, 15 men) with a mean age of 67.9 years. Participants' ideas and perceptions of depression and anxiety showed considerable overlap. Participants attributed depression and anxiety mainly to familial and financial problems, loneliness, loss of independence and past traumatic experiences. Coping strategies used by older adults included 'self-reflection and adaptation' to circumstances, 'do your part', and seeking 'emotional support' mainly from non-professionals (relatives, friends, acquaintances, and religion). Conclusions: Illness experiences of depression and anxiety set the pathway for tailored community-based mental health interventions for older adults. Overlapping narratives and perceptions of depression and anxiety suggest that these conditions should be addressed together. Mental health interventions should incorporate addressing areas related to depression and anxiety such as prevention of loss of independence, trauma, and loneliness. Good acceptability of receiving emotional support for non-professionals might offer an opportunity to incorporate them when delivering mental health care to older adults

Global Health: A Successful Context for Precollege Training and Advocacy

Despite a flourishing biomedical and global health industry [1] too few of Washington state's precollege students are aware of this growing sector and emerging ideas on bacteria, fungi, parasites and viruses. Against the backdrop of numerous reports regarding declining precollege student interest in science [2], a precollege program was envisioned at Seattle Biomedical Research Institute (as of 2010, Seattle BioMed) to increase youth engagement in biomedical research and global health, increase community interest in infectious diseases and mobilize a future biomedical workforce. Since 2005, 169 rising high school juniors have participated in the BioQuest Academy precollege immersion program at Seattle BioMed. Assembling in groups of 12, students conduct laboratory experiments (e.g., anopheline mosquito dissection, gene expression informed tuberculosis drug design and optimizing HIV immunization strategies) related to global health alongside practicing scientific mentors, all within the footprint the institute. Laudable short-term impacts of the program include positive influences on student interest in global health (as seen in the students' subsequent school projects and their participation in Seattle BioMed community events), biomedical careers and graduate school (e.g., 16.9% of teens departing 2008–2009 Academy report revised goals of attaining a doctorate rather than a baccalaureate diploma). Long-term, 97% of alumni (2005–2008) are attending postsecondary schools throughout North America; eight graduates have already published scientific articles in peer-reviewed journals and/or presented their scientific data at national and international meetings, and 26 have been retained by Seattle BioMed researchers as compensated technicians and interns. Providing precollege students with structured access to practicing scientists and authentic research environments within the context of advancing global health has been a robust means of both building a future pool of talented leaders and engaged citizenry and increasing the visibility of health disparities within the community

Revealing the last 13,500 years of environmental history from the multiproxy record of a mountain lake (Lago Enol, northern Iberian Peninsula)

This is the author's accepted manuscript. The final publication is available at Springer via http://dx.doi.org/10.1007/s10933-009-9387-7.We present the Holocene sequence from Lago Enol (43°16′N, 4°59′W, 1,070 m a.s.l.), Cantabrian Mountains, northern Spain. A multiproxy analysis provided comprehensive information about regional humidity and temperature changes. The analysis included sedimentological descriptions, physical properties, organic carbon and carbonate content, mineralogy and geochemical composition together with biological proxies including diatom and ostracod assemblages. A detailed pollen study enabled reconstruction of variations in vegetation cover, which were interpreted in the context of climate changes and human impact. Four distinct stages were recognized for the last 13,500 years: (1) a cold and dry episode that includes the Younger Dryas event (13,500–11,600 cal. year BP); (2) a humid and warmer period characterizing the onset of the Holocene (11,600–8,700 cal. year BP); (3) a tendency toward a drier climate during the middle Holocene (8,700–4,650 cal. year BP); and (4) a return to humid conditions following landscape modification by human activity (pastoral activities, deforestation) in the late Holocene (4,650–2,200 cal. year BP). Superimposed on relatively stable landscape conditions (e.g. maintenance of well established forests), the typical environmental variability of the southern European region is observed at this site.The Spanish Inter-Ministry Commission of Science and Technology (CICYT), the Spanish National Parks agency, the European Commission, the Spanish Ministry of Science, and the European Social Fund

Revealing the last 13,500 years of environmental history from the multiproxy record of a mountain lake (Lago Enol, northern Iberian Peninsula)

This is the author's accepted manuscript. The final publication is available at Springer via http://dx.doi.org/10.1007/s10933-009-9387-7.We present the Holocene sequence from Lago Enol (43°16′N, 4°59′W, 1,070 m a.s.l.), Cantabrian Mountains, northern Spain. A multiproxy analysis provided comprehensive information about regional humidity and temperature changes. The analysis included sedimentological descriptions, physical properties, organic carbon and carbonate content, mineralogy and geochemical composition together with biological proxies including diatom and ostracod assemblages. A detailed pollen study enabled reconstruction of variations in vegetation cover, which were interpreted in the context of climate changes and human impact. Four distinct stages were recognized for the last 13,500 years: (1) a cold and dry episode that includes the Younger Dryas event (13,500–11,600 cal. year BP); (2) a humid and warmer period characterizing the onset of the Holocene (11,600–8,700 cal. year BP); (3) a tendency toward a drier climate during the middle Holocene (8,700–4,650 cal. year BP); and (4) a return to humid conditions following landscape modification by human activity (pastoral activities, deforestation) in the late Holocene (4,650–2,200 cal. year BP). Superimposed on relatively stable landscape conditions (e.g. maintenance of well established forests), the typical environmental variability of the southern European region is observed at this site.The Spanish Inter-Ministry Commission of Science and Technology (CICYT), the Spanish National Parks agency, the European Commission, the Spanish Ministry of Science, and the European Social Fund

Trophic Ecology of Atlantic Bluefin Tuna (Thunnus thynnus) Larvae from the Gulf of Mexico and NW Mediterranean Spawning Grounds: A Comparative Stable Isotope Study

The present study uses stable isotopes of nitrogen and carbon (δ15Nandδ13C) as trophic indicators for Atlantic bluefin tuna larvae (BFT) (6–10mm standard length) in the highly contrasting environmental conditions of the Gulf of Mexico (GOM) and the Balearic Sea (MED). These regions are differentiated by their temperature regime and relative productivity, with the GOM being significantly warmer and more productive. MED BFT larvae showed the highest δ15N signatures, implying an elevated trophic position above the underlyingmicrozooplankton baseline. Ontogenetic dietary shifts were observed in the BFT larvae from the GOM and MED which indicates early life trophodynamics differences between these spawning habitats. Significant trophic differences between the GOM and MED larvae were observed in relation to δ15N signatures in favour of the MED larvae, which may have important implications in their growth during their early life stages. These low δ15N levels in the zooplankton from the GOM may be an indication of a shifting isotopic baseline in pelagic food webs due to diatrophic inputs by cyanobacteria. Lack of enrichment for δ15N in BFT larvae compared to zooplankton implies an alternative grazing pathway from the traditional food chain of phytoplankton— zooplankton—larval fish. Results provide insight for a comparative characterization of the trophic pathways variability of the two main spawning grounds for BFT larvaeVersión del editor4,411

Bacteria are important dimethylsulfoniopropionate producers in coastal sediments

Dimethylsulfoniopropionate (DMSP) and its catabolite dimethyl sulfide (DMS) are key marine nutrients, with roles in global sulfur cycling, atmospheric chemistry, signalling and, potentially, climate regulation. DMSP production was previously thought to be an oxic and photic process, mainly confined to the surface oceans. However, here we show that DMSP concentrations and DMSP/DMS synthesis rates were higher in surface marine sediment from e.g., saltmarsh ponds, estuaries and the deep ocean than in the overlying seawater. A quarter of bacterial strains isolated from saltmarsh sediment produced DMSP (up to 73 mM), and previously unknown DMSP-producers were identified. Most DMSP-producing isolates contained dsyB, but some alphaproteobacteria, gammaproteobacteria and actinobacteria utilised a methionine methylation pathway independent of DsyB, previously only associated with higher plants. These bacteria contained a methionine methyltransferase ‘mmtN’ gene - a marker for bacterial DMSP synthesis via this pathway. DMSP-producing bacteria and their dsyB and/or mmtN transcripts were present in all tested seawater samples and Tara Oceans bacterioplankton datasets, but were far more abundant in marine surface sediment. Approximately 108 bacteria per gram of surface marine sediment are predicted to produce DMSP, and their contribution to this process should be included in future models of global DMSP production. We propose that coastal and marine sediments, which cover a large part of the Earth’s surface, are environments with high DMSP and DMS productivity, and that bacteria are important producers within them

The Receptor Slamf1 on the Surface of Myeloid Lineage Cells Controls Susceptibility to Infection by Trypanosoma cruzi

Trypanosoma cruzi, the protozoan parasite responsible for Chagas' disease, causes severe myocarditis often resulting in death. Here, we report that Slamf1−/− mice, which lack the hematopoietic cell surface receptor Slamf1, are completely protected from an acute lethal parasite challenge. Cardiac damage was reduced in Slamf1−/− mice compared to wild type mice, infected with the same doses of parasites, as a result of a decrease of the number of parasites in the heart even the parasitemia was only marginally less. Both in vivo and in vitro experiments reveal that Slamf1-defIcient myeloid cells are impaired in their ability to replicate the parasite and show altered production of cytokines. Importantly, IFN-γ production in the heart of Slamf1 deficient mice was much lower than in the heart of wt mice even though the number of infiltrating dendritic cells, macrophages, CD4 and CD8 T lymphocytes were comparable. Administration of an anti-Slamf1 monoclonal antibody also reduced the number of parasites and IFN-γ in the heart. These observations not only explain the reduced susceptibility to in vivo infection by the parasite, but they also suggest human Slamf1 as a potential target for therapeutic target against T. cruzi infection

Earliest evidence of pollution by heavy metals in archaeological sites

Homo species were exposed to a new biogeochemical environment when they began to occupy caves. Here we report the first evidence of palaeopollution through geochemical analyses of heavy metals in four renowned archaeological caves of the Iberian Peninsula spanning the last million years of human evolution. Heavy metal contents reached high values due to natural (guano deposition) and anthropogenic factors (e.g. combustion) in restricted cave environments. The earliest anthropogenic pollution evidence is related to Neanderthal hearths from Gorham's Cave (Gibraltar), being one of the first milestones in the so-called “Anthropocene”. According to its heavy metal concentration, these sediments meet the present-day standards of “contaminated soil”. Together with the former, the Gibraltar Vanguard Cave, shows Zn and Cu pollution ubiquitous across highly anthropic levels pointing to these elements as potential proxies for human activities. Pb concentrations in Magdalenian and Bronze age levels at El Pirulejo site can be similarly interpreted. Despite these high pollution levels, the contaminated soils might not have posed a major threat to Homo populations. Altogether, the data presented here indicate a long-term exposure of Homo to these elements, via fires, fumes and their ashes, which could have played certain role in environmental-pollution tolerance, a hitherto neglected influence.Francisco J. Jiménez Palacios and to the Analytical Chemistry Department (Sevilla University) are gratefully acknowledged for their help in the use of Carbolite electric oven. A.G.-A. was supported by a Marie Curie Intra-European Fellowship of the 7th Framework Programme for Research, Technological Development and Demonstration (European Commission). R.B. is a Beatriu de Pinós-A post-doctoral fellowship recipient (Generalitat de Catalunya and COFUND Marie Curie Actions, EU-FP7). This work also was partially financed by projects 19434/PI/14 Fundación Séneca, HARP2013-44269P, CGL-BOS-2012-34717, CGL2012-38434-C03-03 and CGL2012-38358 Ministerio de Economía y Competitividad, 2014 SGR 900 and 2014/100573 Generalitat de Catalunya-AGAUR, RNM 432 Research Group 179 (Junta de Andalucia) and MEXT-Japan

Radio Frequency and DC High Voltage Breakdown of High Pressure Helium, Argon, and Xenon

[EN] Motivated by the possibility of guiding daughter ions from double beta decay events to single-ion sensors for barium tagging, the NEXT collaboration is developing a program of R&D to test radio frequency (RF) carpets for ion transport in high pressure xenon gas. This would require carpet functionality in regimes at higher pressures than have been previously reported, implying correspondingly larger electrode voltages than in existing systems. This mode of operation appears plausible for contemporary RF-carpet geometries due to the higher predicted breakdown strength of high pressure xenon relative to low pressure helium, the working medium in most existing RF carpet devices. In this paper we present the first measurements of the high voltage dielectric strength of xenon gas at high pressure and at the relevant RF frequencies for ion transport (in the 10MHz range), as well as new DC and RF measurements of the dielectric strengths of high pressure argon and helium gases at small gap sizes. We find breakdown voltages that are compatible with stable RF carpet operation given the gas, pressure, voltage, materials and geometry of interest.Woodruff, K.; Baeza-Rubio, J.; Huerta, D.; Jones, BJP.; Mcdonald, AD.; Norman, L.; Nygren, DR.... (2020). Radio Frequency and DC High Voltage Breakdown of High Pressure Helium, Argon, and Xenon. Journal of Instrumentation. 15(4):1-15. https://doi.org/10.1088/1748-0221/15/04/P04022S115154Dehmelt, H. G., & Major, F. G. (1962). Orientation of(He4)+Ions by Exchange Collisions with Cesium Atoms. Physical Review Letters, 8(5), 213-214. doi:10.1103/physrevlett.8.213Wada, M., Ishida, Y., Nakamura, T., Yamazaki, Y., Kambara, T., Ohyama, H., … Katayama, I. (2003). Slow RI-beams from projectile fragment separators. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 204, 570-581. doi:10.1016/s0168-583x(02)02151-1Gehring, A. E., Brodeur, M., Bollen, G., Morrissey, D. J., & Schwarz, S. (2016). Research and development of ion surfing RF carpets for the cyclotron gas stopper at the NSCL. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 376, 221-224. doi:10.1016/j.nimb.2016.02.012Ranjan, M., Purushothaman, S., Dickel, T., Geissel, H., Plass, W. R., Schäfer, D., … Dendooven, P. (2011). New stopping cell capabilities: RF carpet performance at high gas density and cryogenic operation. EPL (Europhysics Letters), 96(5), 52001. doi:10.1209/0295-5075/96/52001Arai, F., Ito, Y., Katayama, I., Schury, P., Sonoda, T., Wada, M., & Wollnik, H. (2015). Performance of Ion Surfing Rf-carpets for High-Energy RI Beam Gas Catcher. Proceedings of the Conference on Advances in Radioactive Isotope Science (ARIS2014). doi:10.7566/jpscp.6.030110Schwarz, S. (2011). RF ion carpets: The electric field, the effective potential, operational parameters and an analysis of stability. International Journal of Mass Spectrometry, 299(2-3), 71-77. doi:10.1016/j.ijms.2010.09.021Paschen, F. (1889). Ueber die zum Funkenübergang in Luft, Wasserstoff und Kohlensäure bei verschiedenen Drucken erforderliche Potentialdifferenz. Annalen der Physik, 273(5), 69-96. doi:10.1002/andp.18892730505Jones, F. L., & Morgan, G. D. (1951). High-Frequency Discharges: I Breakdown Mechanism and Similarity Relationship. Proceedings of the Physical Society. Section B, 64(7), 560-573. doi:10.1088/0370-1301/64/7/303Townsend, W. G., & Williams, G. C. (1958). The Electrical Breakdown of Gases in Uniform High Frequency Fields at Low Pressure. Proceedings of the Physical Society, 72(5), 823-832. doi:10.1088/0370-1328/72/5/318Sato, M., & Shoji, M. (1997). Breakdown Characteristics of RF Argon Capacitive Discharge. Japanese Journal of Applied Physics, 36(Part 1, No. 9A), 5729-5730. doi:10.1143/jjap.36.5729Lisovskiy, V. A., & Yegorenkov, V. D. (1998). Rf breakdown of low-pressure gas and a novel method for determination of electron-drift velocities in gases. Journal of Physics D: Applied Physics, 31(23), 3349-3357. doi:10.1088/0022-3727/31/23/008Fukugita, M., & Yanagida, T. (1986). Barygenesis without grand unification. Physics Letters B, 174(1), 45-47. doi:10.1016/0370-2693(86)91126-3Moe, M. K. (1991). Detection of neutrinoless double-beta decay. Physical Review C, 44(3), R931-R934. doi:10.1103/physrevc.44.r931Sinclair, D., Rollin, E., Smith, J., Mommers, A., Ackeran, N., Aharmin, B., … Breidenbach, M. (2011). Prospects for Barium Tagging in Gaseous Xenon. Journal of Physics: Conference Series, 309, 012005. doi:10.1088/1742-6596/309/1/012005Brunner, T., Fudenberg, D., Sabourov, A., Varentsov, V. L., Gratta, G., & Sinclair, D. (2013). A setup for Ba-ion extraction from high pressure Xe gas for double-beta decay studies with EXO. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 317, 473-475. doi:10.1016/j.nimb.2013.05.086Twelker, K., Kravitz, S., Díez, M. M., Gratta, G., Fairbank, W., Albert, J. B., … Benitez-Medina, C. (2014). An apparatus to manipulate and identify individual Ba ions from bulk liquid Xe. Review of Scientific Instruments, 85(9), 095114. doi:10.1063/1.4895646Mong, B., Cook, S., Walton, T., Chambers, C., Craycraft, A., Benitez-Medina, C., … Auty, D. J. (2015). Spectroscopy of Ba andBa+deposits in solid xenon for barium tagging in nEXO. Physical Review A, 91(2). doi:10.1103/physreva.91.022505Brunner, T., Fudenberg, D., Varentsov, V., Sabourov, A., Gratta, G., Dilling, J., … Albert, J. B. (2015). An RF-only ion-funnel for extraction from high-pressure gases. International Journal of Mass Spectrometry, 379, 110-120. doi:10.1016/j.ijms.2015.01.003Nygren, D. R. (2016). Detection of the barium daughter in 136Xe →136Ba+2e− by in situ single-molecule fluorescence imaging. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 824, 2-5. doi:10.1016/j.nima.2015.11.038Jones, B. J. P., McDonald, A. D., & Nygren, D. R. (2016). Single molecule fluorescence imaging as a technique for barium tagging in neutrinoless double beta decay. Journal of Instrumentation, 11(12), P12011-P12011. doi:10.1088/1748-0221/11/12/p12011Byrnes, N., Foss, F. W., Jones, B. J. ., McDonald, A. D., Nygren, D. R., … Thapa, P. (2019). Progress toward Barium Tagging in High Pressure Xenon Gas with Single Molecule Fluorescence Imaging. Journal of Physics: Conference Series, 1312, 012001. doi:10.1088/1742-6596/1312/1/012001McDonald, A. D., Jones, B. J. P., Nygren, D. R., Adams, C., Álvarez, V., Azevedo, C. D. R., … Cárcel, S. (2018). Demonstration of Single-Barium-Ion Sensitivity for Neutrinoless Double-Beta Decay Using Single-Molecule Fluorescence Imaging. Physical Review Letters, 120(13). doi:10.1103/physrevlett.120.132504(2019). Imaging individual barium atoms in solid xenon for barium tagging in nEXO. Nature, 569(7755), 203-207. doi:10.1038/s41586-019-1169-4Thapa, P., Arnquist, I., Byrnes, N., Denisenko, A. A., Foss, F. W., Jones, B. J. P., … Woodruff, K. (2019). Barium Chemosensors with Dry-Phase Fluorescence for Neutrinoless Double Beta Decay. Scientific Reports, 9(1). doi:10.1038/s41598-019-49283-xMartín-Albo, J., Muñoz Vidal, J., Ferrario, P., Nebot-Guinot, M., Gómez-Cadenas, J. J., … Cárcel, S. (2016). Sensitivity of NEXT-100 to neutrinoless double beta decay. Journal of High Energy Physics, 2016(5). doi:10.1007/jhep05(2016)159Bainglass, E., Jones, B. J. P., Foss, F. W., Huda, M. N., & Nygren, D. R. (2018). Mobility and clustering of barium ions and dications in high-pressure xenon gas. Physical Review A, 97(6). doi:10.1103/physreva.97.062509Postel, O. B., & Cappelli, M. A. (2000). Vacuum emission and breakdown characteristics of a planar He–Xe microdischarge. Applied Physics Letters, 76(5), 544-546. doi:10.1063/1.125813Sosov, Y., & Theodosiou, C. E. (2004). Determination of electric field-dependent effective secondary emission coefficients for He/Xe ions on brass. Journal of Applied Physics, 95(8), 4385-4388. doi:10.1063/1.1655677Lieberman, M. A., & Lichtenberg, A. J. (2005). Principles of Plasma Discharges and Materials Processing. doi:10.1002/0471724254Lisovskiy, V. A., Yakovin, S. D., & Yegorenkov, V. D. (2000). Low-pressure gas breakdown in uniform dc electric field. Journal of Physics D: Applied Physics, 33(21), 2722-2730. doi:10.1088/0022-3727/33/21/310Smith, H. B., Charles, C., & Boswell, R. W. (2003). Breakdown behavior in radio-frequency argon discharges. Physics of Plasmas, 10(3), 875-881. doi:10.1063/1.1531615Bhattacharya, A. K. (1976). Measurement of breakdown potentials and Townsend ionization coefficients for the Penning mixtures of neon and xenon. Physical Review A, 13(3), 1219-1225. doi:10.1103/physreva.13.1219Jacques, L., Bruynooghe, W., Boucique, R., & Wieme, W. (1986). Experimental determination of the primary and secondary ionisation coefficients in krypton and xenon. Journal of Physics D: Applied Physics, 19(9), 1731-1739. doi:10.1088/0022-3727/19/9/017Bradford, H. M., Fraser, D. M., Langstroth, G. F. O., & MacDonald, A. D. (1959). ELECTRICAL BREAKDOWN IN XENON AND KRYPTON AT ULTRAHIGH FREQUENCIES. Canadian Journal of Physics, 37(10), 1166-1170. doi:10.1139/p59-133Park, J., Henins, I., Herrmann, H. W., & Selwyn, G. S. (2001). Gas breakdown in an atmospheric pressure radio-frequency capacitive plasma source. Journal of Applied Physics, 89(1), 15-19. doi:10.1063/1.1323754Moravej, M., Yang, X., Nowling, G. R., Chang, J. P., Hicks, R. F., & Babayan, S. E. (2004). Physics of high-pressure helium and argon radio-frequency plasmas. Journal of Applied Physics, 96(12), 7011-7017. doi:10.1063/1.1815047Borg Dezani, V., & Ginoux, J. L. (1994). Investigation of breakdown voltage curves for pure helium and silane–helium mixtures. Physics of Plasmas, 1(4), 1060-1063. doi:10.1063/1.870786McDonald, A. D., Woodruff, K., Atoum, B. A., González-Díaz, D., Jones, B. J. P., Adams, C., … Azevedo, C. D. . (2019). Electron drift and longitudinal diffusion in high pressure xenon-helium gas mixtures. Journal of Instrumentation, 14(08), P08009-P08009. doi:10.1088/1748-0221/14/08/p08009Rogers, L., Clark, R. A., Jones, B. J. P., McDonald, A. D., Nygren, D. R., Psihas, F., … Azevedo, C. D. . (2018). High voltage insulation and gas absorption of polymers in high pressure argon and xenon gases. Journal of Instrumentation, 13(10), P10002-P10002. doi:10.1088/1748-0221/13/10/p10002Okawa, M., Shioiri, T., Okubo, H., & Yanabu, S. (1988). Area effect on electric breakdown of copper and stainless steel electrodes in vacuum. IEEE Transactions on Electrical Insulation, 23(1), 77-81. doi:10.1109/14.2336Kihara, T. (1952). The Mathematical Theory of Electrical Discharges in Gases. Reviews of Modern Physics, 24(1), 45-61. doi:10.1103/revmodphys.24.45Hamaker, A., Brodeur, M., Kelly, J. M., Long, J., Nicoloff, C., Ryan, S., … Wada, M. (2016). Experimental investigation of the repelling force from RF carpets. International Journal of Mass Spectrometry, 404, 14-19. doi:10.1016/j.ijms.2016.04.00