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1. EU cost action on future generation optical wireless communication technologies -- newfocus ca19111, a white paper

Author

Khalighi, M A, Ghassemlooy, Z, Zvanovec, S, Stevens, N, Alves, L N, Shrestha, A, Uysal, M, Vegni, A M, Diamantoulakis, P D, Papanikolaou, V K, Karagiannidis, G K, Ortega, B, Almenar, V, Bouchet, O, and Ladid, L

Subjects
Computer Science - Networking and Internet Architecture, Electrical Engineering and Systems Science - Signal Processing
Abstract

The EU COST Action NEWFOCUS is focused on investigating radical solutions with the potential to impact the design of future wireless networks. It aims to address some of the challenges in OWC and establish it as an efficient technology that can satisfy the demanding requirements of backhaul and access network levels in 5G networks. This also includes the use of hybrid links that associate OWC with radiofrequency or wired/fiber-based technologies. The focus of this White Paper is on the use of optical wireless communication (OWC) as enabling technology in a range of areas outlined in HE's Pillar II including Health, Manufacturing, Intelligent Transportation Systems (ITS), Unmanned Aerial Vehicles and Network and Protocol.

Published
2022

2. Underwater dual-magnification imaging for automated lake plankton monitoring

Author

Merz, E., Kozakiewicz, T., Reyes, M., Ebi, C., Isles, P., Baity-Jesi, M., Roberts, P., Jaffe, J. S., Dennis, S., Hardeman, T., Stevens, N., Lorimer, T., and Pomati, F.

Subjects
Quantitative Biology - Populations and Evolution, Physics - Instrumentation and Detectors
Abstract

We present an approach for automated in-situ monitoring of phytoplankton and zooplankton communities based on a dual magnification dark-field imaging microscope/camera. We describe the Dual Scripps Plankton Camera (DSPC) system and associated image processing, and assess its capabilities in detecting and characterizing plankton species of different size and taxonomic categories, and in measuring their abundances in both laboratory and field applications. In the laboratory, body size and abundance estimates by the DSPC significantly and robustly scale with the same measurements derived by traditional microscopy. In the field, a DSPC installed permanently at 3 m depth in Lake Greifensee (Switzerland), delivered images of plankton individuals, colonies, and heterospecific aggregates without disrupting natural arrangements of interacting organisms, their microenvironment or their behavior at hourly timescales. The DSPC was able to track the dynamics of taxa in the size range between ~10 $\mu$m to ~ 1 cm, covering virtually all the components of the planktonic food web (including parasites and potentially toxic cyanobacteria). Comparing data from the field-deployed DSPC to traditional sampling and microscopy revealed a general overall agreement in estimates of plankton diversity and abundances, despite imaging limitations in detecting small phytoplankton species and rare and large zooplankton taxa (e.g. carnivorous zooplankton). The most significant disagreements between traditional methods and the DSPC resided in the measurements of community properties of zooplankton, organisms that are heterogeneously distributed spatially and temporally, and whose demography appeared to be better captured by automated imaging. Time series collected by the DSPC depicted ecological succession patterns, algal bloom dynamics and circadian fluctuations with a temporal frequency and morphological [continues...], Comment: 49 pages

Published
2021
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3. Self-reported PTSD symptoms and social support in U.S. military service members and veterans: a meta-analysis

Author

Blais, RK, Tirone, V, Orlowska, D, Lofgreen, A, Klassen, B, Held, P, Stevens, N, and Zalta, AK

Subjects
Posttraumatic stress disorder, social support, military, veterans, active duty, Clinical Sciences, Psychology
Abstract

Background: The mental health burden of posttraumatic stress disorder (PTSD) is high in U.S. military samples. Social support is one of the most robust protective factors against PTSD and a recent meta-analysis indicates that this relationship is even stronger in military samples compared to civilian samples. Yet no meta-analyses have explored factors impacting this association in veterans and military service members (VSMs). Objective: The current meta-analysis examined demographic, social support, and military characteristics that may moderate the relationship of PTSD severity and social support among U.S. VSMs. Method: A search identified 37 cross-sectional studies, representing 38 unique samples with a total of 18,766 individuals. Results: The overall random effects estimate was −.33 (95% CI: −.38, −.27, Z = −10.19, p

Published
2021

11. Sleep and Psychological Well-Being

Author

Hamilton, N. A., Nelson, C. A., and Stevens, N.

Abstract

Although many studies have linked sleep problems with symptoms of psychopathology, fewer studies have examined the relationship between sleep and dimensions of psychological health as well as depression. To fill this gap, 502 community residents were surveyed about sleep habits, symptoms of anxiety and depression, as well as Ryff's six dimensions of psychological well-being. Using cut-offs suggested by epidemiological research, participants were classified as either optimal sleepers (those reporting an average of 6 hours or less than 8.5 hours per night) or suboptimal sleepers (those sleeping less than 6 hours or 8.5 or more hours per night). After controlling for demographic differences (i.e., sex, age, education, ethnicity, employment status, marital status, presence of children), the Multivariate Analysis of Covariance (MANCOVA) suggested that optimal sleepers reported fewer symptoms of depression, and anxiety, and reported higher levels of environmental mastery, personal growth, positive relations with others, purpose in life, and self acceptance. Differences between optimal sleepers and non-optimal sleepers in depressive symptoms, positive relations with others, purpose in life and self-acceptance remained significant when people with mild to moderate symptoms of depression were eliminated from the data set. These results are consistent with a theoretical framework that defines sleep as a resource related to stress management and self-regulation.

Published
2007
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12. Ecological and Cultural Understanding as a Basis for Management of a Globally Significant Island Landscape

Author

Walker, KE, Baldwin, C, Conroy, GC, Applegate, G, Archer-Lean, C, Arthington, AH, Behrendorff, L, Gilby, BL, Hadwen, W, Henderson, CJ, Jacobsen, C, Lamb, D, Lieske, SN, Ogbourne, SM, Olds, AD, Ota, L, Ribbe, J, Sargent, S, Schaffer, V, Schlacher, TA, Stevens, N, Srivastava, SK, Weston, Mike, Ellison, AM, Walker, KE, Baldwin, C, Conroy, GC, Applegate, G, Archer-Lean, C, Arthington, AH, Behrendorff, L, Gilby, BL, Hadwen, W, Henderson, CJ, Jacobsen, C, Lamb, D, Lieske, SN, Ogbourne, SM, Olds, AD, Ota, L, Ribbe, J, Sargent, S, Schaffer, V, Schlacher, TA, Stevens, N, Srivastava, SK, Weston, Mike, and Ellison, AM

Abstract

Islands provide the opportunity to explore management regimes and research issues related to the isolation, uniqueness, and integrity of ecological systems. K’gari (Fraser Island) is an Australian World Heritage property listed based on its outstanding natural value, specifically, the unique wilderness characteristics and the diversity of ecosystem types. Our goal was to draw on an understanding of the natural and cultural environment of K’gari as a foundation on which to build a management model that includes First Nations Peoples in future management and research. Our research involved an analysis of papers in the peer-reviewed scientific literature, original reports, letters, and other manuscripts now housed in the K’gari Fraser Island Research Archive. The objectives of the research were: (1) to review key historical events that form the cultural, social, and environmental narrative; (2) review the major natural features of the island and threats; (3) identify the gaps in research; (4) analyse the management and conservation challenges associated with tourism, biosecurity threats, vegetation management practices, and climate change and discuss whether the requirements for sustaining island ecological integrity can be met in the future; and (5) identify commonalities and general management principles that may apply globally to other island systems and other World Heritage sites listed on the basis of their unique natural and cultural features. We found that the characteristics that contribute to island uniqueness are also constraints for research funding and publication; however, they are important themes that warrant more investment. Our review suggests that K’gari is a contested space between tourist visitation and associated environmental impacts, with an island that has rich First Nations history, extraordinary ecological diversity, and breathtaking aesthetic beauty. This juxtaposition is reflected in disparate views of custodianship and use, and the

Published
2022

13. Terrestrial and Freshwater Ecosystems and Their Services

Author

Singh, Bettina, Parmesan, C, Morecroft, MD, Trisurat, Y, Adrian, R, Anshari, GZ, Arneth, A, Gao, Q, Gonzalez, P, Harris, R, Price, J, Stevens, N, Talukdar, GH, Strutz, SE, Ackerly, DD, Anderson, E, Boyd, P, Birkmann, J, Bremerich, V, Brotons, L, Buotte, P, Campbell, D, Castellanos, E, Chen, Y-Y, Cissé, G, Cooley, S, Cowie, A, Dhimal, M, Domisch, S, Donner, S, Douwes, Errol, Escobar, LE, Rivera Ferre, M, Flecker, A, Foden, W, Gallagher, RV, Gaxiola, A, Gemeda, A, Goulding, M, Grey, K-A, López Gunn, E, Harrison, S, Hicke, J, Hilmi, NJM, Barragan-Jason, G, Keith, DA, Bezner Kerr, R, Kraemer, BM, Langhans, S, Lasco, R, Latimer, A, Lempert, R, Lluch-Cota, SE, Loisel, J, Mackey, J, Martinetto, P, Matthews, R, McPhearson, T, Mauritzen, M, Midgley, G, Mordecai, E, Moreira, F, Mukherji, A, Myers-Smith, I, Nabuurs, G-J, Neufeldt, H, Pearce-Higgins, J, Pecl, G, Pedace, R, Townsend Peterson, A, Piepenburg, D, Postigo, JC, Pulhin, J, Racault, M-F, Rocklöv, J, Rogelj, J, Rost, B, Romanello, M, Gallego-Sala, A, Schmidt, D, Schoeman, D, Seddon, N, Semenza, JC, Singer, MC, Singh, PK, Slingsby, J, Smith, P, Sukumar, R, Tirado, MC, Trisos, C, Turetsky, M, Turner, B, van Aalst, M, Young, K, Singh, Bettina, Parmesan, C, Morecroft, MD, Trisurat, Y, Adrian, R, Anshari, GZ, Arneth, A, Gao, Q, Gonzalez, P, Harris, R, Price, J, Stevens, N, Talukdar, GH, Strutz, SE, Ackerly, DD, Anderson, E, Boyd, P, Birkmann, J, Bremerich, V, Brotons, L, Buotte, P, Campbell, D, Castellanos, E, Chen, Y-Y, Cissé, G, Cooley, S, Cowie, A, Dhimal, M, Domisch, S, Donner, S, Douwes, Errol, Escobar, LE, Rivera Ferre, M, Flecker, A, Foden, W, Gallagher, RV, Gaxiola, A, Gemeda, A, Goulding, M, Grey, K-A, López Gunn, E, Harrison, S, Hicke, J, Hilmi, NJM, Barragan-Jason, G, Keith, DA, Bezner Kerr, R, Kraemer, BM, Langhans, S, Lasco, R, Latimer, A, Lempert, R, Lluch-Cota, SE, Loisel, J, Mackey, J, Martinetto, P, Matthews, R, McPhearson, T, Mauritzen, M, Midgley, G, Mordecai, E, Moreira, F, Mukherji, A, Myers-Smith, I, Nabuurs, G-J, Neufeldt, H, Pearce-Higgins, J, Pecl, G, Pedace, R, Townsend Peterson, A, Piepenburg, D, Postigo, JC, Pulhin, J, Racault, M-F, Rocklöv, J, Rogelj, J, Rost, B, Romanello, M, Gallego-Sala, A, Schmidt, D, Schoeman, D, Seddon, N, Semenza, JC, Singer, MC, Singh, PK, Slingsby, J, Smith, P, Sukumar, R, Tirado, MC, Trisos, C, Turetsky, M, Turner, B, van Aalst, M, and Young, K

Published
2022

14. Terrestrial and Freshwater Ecosystems and Their Services (Chapter 2)

Author

Pörtner, H.-O., Roberts, D.C., Tignor, M., Poloczanska, E.S., Mintenbeck, K, Alegría, A., Craig, M., Langsdorf, S., Löschke, S., Möller, V., Okem, A., Rama, B., Parmesan, C., Morecroft, M.D., Trisurat, Y., Adrian, R., Anshari, G.Z., Arneth, A., Gao, Q., Gonzalez, P., Harris, R., Price, J., Stevens, N., Talukdarr, G.H., Pörtner, H.-O., Roberts, D.C., Tignor, M., Poloczanska, E.S., Mintenbeck, K, Alegría, A., Craig, M., Langsdorf, S., Löschke, S., Möller, V., Okem, A., Rama, B., Parmesan, C., Morecroft, M.D., Trisurat, Y., Adrian, R., Anshari, G.Z., Arneth, A., Gao, Q., Gonzalez, P., Harris, R., Price, J., Stevens, N., and Talukdarr, G.H.

Abstract

Chapter 2, building on prior assessments1, provides a global assessment of the observed impacts and projected risks of climate change to terrestrial and freshwater ecosystems, including their component species and the services they provide to people. Where possible, differences among regions, taxonomic groups and ecosystem types are presented. Adaptation options to reduce risks to ecosystems and people are assessed.

Published
2022

15. Surgery for constipation: systematic review and clinical guidance: Paper 1: Introduction & Methods

Author

Knowles, C. H., Grossi, U., Horrocks, E. J., Pares, D., Vollebregt, P. F., Chapman, M., Brown, S. R., Mercer‐Jones, M., Williams, A. B., Hooper, R. J., Stevens, N., Mason, J., Campbell, Kenneth, Clarke, Andrew, Cruickshank, Neil, Dixon, Anthony, Emmett, Christopher, Lacy‐Colson, Jon, Lindsey, Ian, Miller, Andrew, Pilkington, Sophie, Smart, Neil, Tincello, Douglas, Telford, Karen, Yiannakou, Yan, Altomare, Donato, Boenicke, Lars, Buntzen, Steen, Campbell, Ken, Christensen, Peter, DʼHoore, Andre, Espin, Eloy, Jayne, David, Jones, Oliver, Knapp, Jens‐Christian, Laurberg, Soren, Lehur, Paul, Matzel, Klaus, OʼConnell, Ronan, Prudʼhomme, Michel, Ratto, Carlo, Trompetto, Mario, and Vaizey, Caroline

Published
2017
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16. Surgery for constipation: systematic review and practice recommendations: Graded practice and future research recommendations

Author

Knowles, C. H., Grossi, U., Horrocks, E. J., Pares, D., Vollebregt, P. F., Chapman, M., Brown, S., Mercer‐Jones, M., Williams, A. B., Yiannakou, Y., Hooper, R. J., Stevens, N., Mason, J., Campbell, Kenneth, Clarke, Andrew, Cruickshank, Neil, Dixon, Anthony, Emmett, Christopher, Lacy‐Colson, Jon, Lindsey, Ian, Miller, Andrew, Pilkington, Sophie, Smart, Neil, Tincello, Douglas, Telford, Karen, Altomare, Donato, Boenicke, Lars, Buntzen, Steen, Campbell, Ken, Christensen, Peter, DʼHoore, Andre, Espin, Eloy, Jayne, David, Jones, Oliver, Knapp, Jens‐Christian, Laurberg, Soren, Lehur, Paul, Matzel, Klaus, OʼConnell, Ronan, Prudhomme, Michel, Ratto, Carlo, Trompetto, Mario, and Vaizey, Carolynne

Published
2017
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33. Bedforms of Thwaites Glacier, West Antarctica: Character and Origin

Author

Alley, RB, Holschuh, N, MacAyeal, DR, Parizek, BR, Zoet, L, Riverman, K, Muto, A, Christianson, K, Clyne, E, Anandakrishnan, S, Stevens, N, Collaboration, GHOST, Alley, RB, Holschuh, N, MacAyeal, DR, Parizek, BR, Zoet, L, Riverman, K, Muto, A, Christianson, K, Clyne, E, Anandakrishnan, S, Stevens, N, and Collaboration, GHOST

Abstract

Bedforms of Thwaites Glacier, West Antarctica both record and affect ice flow, as shown by geophysical data and simple models. Thwaites Glacier flows across the tectonic fabric of the West Antarctic rift system with its bedrock highs and sedimentary basins. Swath radar and seismic surveys of the glacier bed have revealed soft-sediment flutes 100 m or more high extending 15 km or more across basins downglacier from bedrock highs. Flutes end at prominent hard-bedded moats on stoss sides of the next topographic highs. We use simple models to show that ice flow against topography increases pressure between ice and till upglacier along the bed over a distance that scales with the topography. In this basal zone of high pressure, ice-contact water would be excluded, thus increasing basal drag by increasing ice-till coupling and till flux, removing till to allow bedrock erosion that creates moats. Till carried across highlands would then be deposited in lee-side positions forming bedforms that prograde downglacier over time, and that remain soft on top through feedbacks that match till-deformational fluxes from well upglacier of the topography. The bedforms of the part of Thwaites surveyed here are prominent because ice flow has persisted over a long time on this geological setting, not because ice flow is anomalous. Bedform development likely has caused evolution of ice flow over time as till and lubricating water were redistributed, moats were eroded and bedforms grew.

Published
2021

34. Ten new insights in climate science 2021: a horizon scan

Author

Martin, MA, Alcaraz Sendra, O, Bastos, A, Bauer, N, Bertram, C, Blenckner, T, Bowen, K, Brando, PM, Rudolph, TB, Buchs, M, Bustamante, M, Chen, D, Cleugh, H, Dasgupta, P, Denton, F, Donges, JF, Donkor, FK, Duan, H, Duarte, CM, Ebi, KL, Edwards, CM, Engel, A, Fisher, E, Fuss, S, Gaertner, J, Gettelman, A, Girardin, CAJ, Golledge, NR, Green, JF, Grose, MR, Hashizume, M, Hebden, S, Hepach, H, Hirota, M, Hsu, H-H, Kojima, S, Lele, S, Lorek, S, Lotze, HK, Matthews, HD, McCauley, D, Mebratu, D, Mengis, N, Nolan, RH, Pihl, E, Rahmstorf, S, Redman, A, Reid, CE, Rockstrom, J, Rogelj, J, Saunois, M, Sayer, L, Schlosser, P, Sioen, GB, Spangenberg, JH, Stammer, D, Sterner, TNS, Stevens, N, Thonicke, K, Tian, H, Winkelmann, R, Woodcock, J, Martin, MA, Alcaraz Sendra, O, Bastos, A, Bauer, N, Bertram, C, Blenckner, T, Bowen, K, Brando, PM, Rudolph, TB, Buchs, M, Bustamante, M, Chen, D, Cleugh, H, Dasgupta, P, Denton, F, Donges, JF, Donkor, FK, Duan, H, Duarte, CM, Ebi, KL, Edwards, CM, Engel, A, Fisher, E, Fuss, S, Gaertner, J, Gettelman, A, Girardin, CAJ, Golledge, NR, Green, JF, Grose, MR, Hashizume, M, Hebden, S, Hepach, H, Hirota, M, Hsu, H-H, Kojima, S, Lele, S, Lorek, S, Lotze, HK, Matthews, HD, McCauley, D, Mebratu, D, Mengis, N, Nolan, RH, Pihl, E, Rahmstorf, S, Redman, A, Reid, CE, Rockstrom, J, Rogelj, J, Saunois, M, Sayer, L, Schlosser, P, Sioen, GB, Spangenberg, JH, Stammer, D, Sterner, TNS, Stevens, N, Thonicke, K, Tian, H, Winkelmann, R, and Woodcock, J

Abstract

Non-technical summary We summarize some of the past year's most important findings within climate change-related research. New research has improved our understanding about the remaining options to achieve the Paris Agreement goals, through overcoming political barriers to carbon pricing, taking into account non-CO2factors, a well-designed implementation of demand-side and nature-based solutions, resilience building of ecosystems and the recognition that climate change mitigation costs can be justified by benefits to the health of humans and nature alone. We consider new insights about what to expect if we fail to include a new dimension of fire extremes and the prospect of cascading climate tipping elements. Technical summary A synthesis is made of 10 topics within climate research, where there have been significant advances since January 2020. The insights are based on input from an international open call with broad disciplinary scope. Findings include: (1) the options to still keep global warming below 1.5 °C; (2) the impact of non-CO2factors in global warming; (3) a new dimension of fire extremes forced by climate change; (4) the increasing pressure on interconnected climate tipping elements; (5) the dimensions of climate justice; (6) political challenges impeding the effectiveness of carbon pricing; (7) demand-side solutions as vehicles of climate mitigation; (8) the potentials and caveats of nature-based solutions; (9) how building resilience of marine ecosystems is possible; and (10) that the costs of climate change mitigation policies can be more than justified by the benefits to the health of humans and nature. Social media summary How do we limit global warming to 1.5 °C and why is it crucial? See highlights of latest climate science.

Published
2021

39. A handbook for the standardised sampling of plant functional traits in disturbance-prone ecosystems, with a focus on open ecosystems

Author

Wigley, B. J., Charles-Dominique, T., Hempson, G. P., Stevens, N., TeBeest, M., Archibald, S., Bond, W. J., Bunney, K., Coetsee, C., Donaldson, J., Fidelis, A., Gao, X., Gignoux, J., Lehmann, C., Massad, T. J., Midgley, J. J., Millan, M., Schwilk, D., Siebert, F., Solofondranohatra, C., Staver, A. C., Zhou, Y., Kruger, L. M., Wigley, B. J., Charles-Dominique, T., Hempson, G. P., Stevens, N., TeBeest, M., Archibald, S., Bond, W. J., Bunney, K., Coetsee, C., Donaldson, J., Fidelis, A., Gao, X., Gignoux, J., Lehmann, C., Massad, T. J., Midgley, J. J., Millan, M., Schwilk, D., Siebert, F., Solofondranohatra, C., Staver, A. C., Zhou, Y., and Kruger, L. M.

Abstract

Plant functional traits provide a valuable tool to improve our understanding of ecological processes at a range of scales. Previous handbooks on plant functional traits have highlighted the importance of standardising measurements of traits to improve our understanding of ecological and evolutionary processes. In open ecosystems (i.e. grasslands, savannas, open woodlands and shrublands), traits related to disturbance (e.g. herbivory, drought, and fire) play a central role in explaining species performance and distributions and are the focus of this handbook. We provide brief descriptions of 34 traits and list important environmental filters and their relevance, provide detailed sampling methodologies and outline potential pitfalls for each trait. We have grouped traits according to plant functional type (grasses, forbs and woody plants) and, because demographic stages may experience different selective pressures, we have separated traits according to the different plant life stages (seedlings saplings and adults). We have attempted to not include traits that have been covered in previous handbooks except for where updates or additional information was considered beneficial.

Published
2020

41. A handbook for the standardised sampling of plant functional traits in disturbance-prone ecosystems, with a focus on open ecosystems

Author

Spatial Ecology and Global Change, Environmental Sciences, Wigley, B. J., Charles-Dominique, T., Hempson, G. P., Stevens, N., TeBeest, M., Archibald, S., Bond, W. J., Bunney, K., Coetsee, C., Donaldson, J., Fidelis, A., Gao, X., Gignoux, J., Lehmann, C., Massad, T. J., Midgley, J. J., Millan, M., Schwilk, D., Siebert, F., Solofondranohatra, C., Staver, A. C., Zhou, Y., Kruger, L. M., Spatial Ecology and Global Change, Environmental Sciences, Wigley, B. J., Charles-Dominique, T., Hempson, G. P., Stevens, N., TeBeest, M., Archibald, S., Bond, W. J., Bunney, K., Coetsee, C., Donaldson, J., Fidelis, A., Gao, X., Gignoux, J., Lehmann, C., Massad, T. J., Midgley, J. J., Millan, M., Schwilk, D., Siebert, F., Solofondranohatra, C., Staver, A. C., Zhou, Y., and Kruger, L. M.

Published
2020

42. Corrigendum to: A handbook for the standardised sampling of plant functional traits in disturbance-prone ecosystems, with a focus on open ecosystems

Author

Wigley, B. J., primary, Charles-Dominique, T., additional, Hempson, G. P., additional, Stevens, N., additional, te Beest, M., additional, Archibald, S., additional, Bond, W. J., additional, Bunney, K., additional, Coetsee, C., additional, Donaldson, J., additional, Fidelis, A., additional, Gao, X., additional, Gignoux, J., additional, Lehmann, C., additional, Massad, T. J., additional, Midgley, J. J., additional, Millan, M., additional, Schwilk, D., additional, Siebert, F., additional, Solofondranohatra, C., additional, Staver, A. C., additional, Zhou, Y., additional, and Kruger, L. M., additional

Published
2021
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44. Studies in spermatogenesis ... By N. M. Stevens.

Author

Stevens, N. M. (Nettie Maria), 1861-1912, University of California Libraries (archive.org), and Stevens, N. M. (Nettie Maria), 1861-1912

Subjects
Sex, Spermatogenesis
Published
1905

45. Studies in spermatogenesis

Author

Stevens, N. M. (Nettie Maria), 1861-1912, Cornell University Library, MBLWHOI Library, University of California Libraries (archive.org), and Stevens, N. M. (Nettie Maria), 1861-1912

Subjects
Sex, Spermatogenesis
Published
1905

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