804 results on '"Williams AL"'
Search Results
202. EXPERIENCE WITH RENAL BIOPSY IN CHILDREN: A PRELIMINARY REPORT
- Author
-
Fowler R, Coldbeck Jh, and Williams Al
- Subjects
medicine.medical_specialty ,medicine.diagnostic_test ,business.industry ,Preliminary report ,Biopsy ,medicine ,General Medicine ,Renal biopsy ,Radiology ,business - Published
- 1963
- Full Text
- View/download PDF
203. Microcontroller Projects With Basic Stamps
- Author
-
Williams, Al and Williams, Al
- Subjects
- Programmable controllers, Embedded computer systems
- Published
- 2000
204. Analise sobre os discursos de violência nas periferias urbanas de Cartagena (Colômbia) Uma pornografia da violência?
- Author
-
Williams Álvarez
- Subjects
Pandillas ,violencia urbana ,discursos ,barrio ,vida precaria. ,Communication. Mass media ,P87-96 - Abstract
Este artículo es un experimento metodológico que tiene como fin ayudar en la construcción de un objeto de investigación sociológica. Aquí se analizan cinco años de artículos periodísticos sobre pandillas que actúan principalmente en las periferias urbanas pobres de la ciudad de Cartagena. Con este proceso, se quiere establecer los principales discursos sociales, públicos y mediáticos que existen alrededor de la emergencia de estas pandillas como fenómeno social violento. Proceso mediático que a su vez está produciendo un régimen visual al que describo aquí como una pornografía de la violencia.
- Published
- 2017
- Full Text
- View/download PDF
205. FULL GUN.
- Author
-
Williams, Al
- Subjects
- *
SEAPLANES , *AMPHIBIAN planes , *CLIPPER ships , *SAILING ships - Abstract
Discusses the story of the Navy Curtiss seaplane racers that emerged from their crates at Cowes, England for the Schneider Trophy contest in 1931. Sailing speed of the clipper ship; Possibility in the development of high speed in a monoplane; Principle of controlling a racing plane.
- Published
- 1931
206. BALLOONS.
- Author
-
Williams, Al
- Subjects
- *
BALLOONS , *AIRSHIPS , *AERONAUTICS , *ARMED forces - Abstract
The article provides information on the division of aeronautics that consists of balloons and airships and sometimes called dirigibles in the U.S. These balloons or airships left the earth through the principle of buoyancy which explains the flotation. These balloons were found useful to the armies during the World War thus, the Good Year Tire and Rubber Co. has created kite and observation balloons for the Allied armies.
- Published
- 1931
207. Speaking of books
- Author
-
Eklund, Susan, Williams, Nofflet, Williams, Al, Boismier, J., Bricker, Diane, and Russell, Anna Loe
- Abstract
Disadvantaged Child, Vol. I. Jerome Hellmuth, editor. Seattle, Washington: Special Child Publications, 1967. Pp. 499. $10.00.Federal Aid for Schools. Howard S. Rowland and Richard L. Wing. New York: The Macmillan Company, 1967. Pp. 396.Psychology of Human Adjustment. Lester D. Crow. New York: Alfred A. Knopf, 1967. xv, 613 pp. $7.95.School Children in the Urban Slum. Joan I. Roberts, editor. New York: The Free Press, 1967. xiii and 626 pp. $7.50.Speech Handicapped School Children, Wendell Johnson and Dorothy Moeller, editors. Harper & Row, New York, 1967. Pp. 562. $7.50.Edward Hitchcock, M.D., Founder of Physical Education in the College Curriculum. J. Edmund Welch. East Carolina College, Greenville, North Carolina, J. Edmund Welch, 1966. 315 pp. $5.00.
- Published
- 1968
- Full Text
- View/download PDF
208. CT Anatomy of the Spine
- Author
-
Haughton Vm and Williams Al
- Subjects
musculoskeletal diseases ,Facet (geometry) ,business.industry ,Contrast resolution ,Soft tissue ,Intervertebral disc ,Anatomy ,musculoskeletal system ,Spinal cord ,Epidural veins ,medicine.anatomical_structure ,medicine ,Gross anatomy ,business ,Image resolution - Abstract
Effective CT scanning of the spine requires gantry opening greater than 50 cm, spatial resolution of less than 1 mm, contrast resolution of better than 0.5%, and a method for exact localization and selection of cut levels. With a suitable scanner, excellent images of the intervertebral disc, dural sac, spinal cord, facet joints, ligamentum flavum, and epidural veins can be obtained. The purpose of this report is to describe the normal CT apprearance of the spinal soft tissues.
- Published
- 1980
- Full Text
- View/download PDF
209. Letters to the Editor.
- Author
-
Whitman, Jack, Summer, Jason, Longron, Jason, Marullo, Lou, Williams, Al, McLeod, D. G., Stafford, W. M., Steele, Kenneth, Martin, J. H. Chuck, Beard, Clay, Childree, Steve, and Hannah, James
- Subjects
LETTERS to the editor ,ADVERTISING campaigns ,CORPORATE sponsorship ,BOWHUNTING ,EDITORS - Abstract
Several letters to the editor are presented in response to various articles, including the issue on a campaign against Budweiser-ShareLunker sponsorship in the January 2007 "Texas Fish & Game Report," "Bowhunting Technology," by Lou Marullo in the February 2008 issue, and the appointment of Bob Hood as the new hunting editor.
- Published
- 2008
210. Al Williams rips Earhart 'stunt' flight
- Author
-
Cleveland Press (Cleveland, Ohio : 1889), Williams, Al, Cleveland Press (Cleveland, Ohio : 1889), and Williams, Al
- Abstract
Newspaper clipping, 'Al Williams Rips Earhart 'Stunt' Flight: Crack Pilot Says Motive was Profit, Not Science; Hits Ocean Jaunts,' Cleveland Press, March 31, 1937
- Published
- 1937
211. Home of happy feet : a swinging tribute to the great bands and tunes featured at New York's legendary Savoy Ballroom (titre avec le sous titre du contenant)
- Author
-
"Howard, Joe (chanteur); Shorty Sherock, trompettiste soliste); Van Alexandre et son orchestre rendent hommage aux directeurs d'orchestres, solistes instrumentaux, et chanteurs jazz et swing qui étaient parmi les interprètes les plus célèbres qui figuraient à la salle de danse, The Savoy Ballroom (Chick Webb, The Savoy Eight (octuor de membres solistes de l'orchestre jazz de C. Webb), Ella Fitzgerald, Don Redman, Andy Kirk, Teddy Hill, Benny Goodman, John Kirby, Claude Hopkins, Duke Ellington, Cootie Williams, Al Cooper, Lucky Millander, Henry ""Red"" Allen)", Alexander, Van, "Howard, Joe (chanteur); Shorty Sherock, trompettiste soliste); Van Alexandre et son orchestre rendent hommage aux directeurs d'orchestres, solistes instrumentaux, et chanteurs jazz et swing qui étaient parmi les interprètes les plus célèbres qui figuraient à la salle de danse, The Savoy Ballroom (Chick Webb, The Savoy Eight (octuor de membres solistes de l'orchestre jazz de C. Webb), Ella Fitzgerald, Don Redman, Andy Kirk, Teddy Hill, Benny Goodman, John Kirby, Claude Hopkins, Duke Ellington, Cootie Williams, Al Cooper, Lucky Millander, Henry ""Red"" Allen)", and Alexander, Van
- Abstract
Jazz et swing: Anglais, Palmaro Collections Pouchet
- Published
- 1959
212. A new business code for Kansas : an analysis of the General Corporation Code of Kansas
- Author
-
Williams, Al F. and Williams, Al F.
- Subjects
- Corporation law Kansas., Commercial law Kansas., Sociétés Législation. Droit Kansas, Commercial law, Corporation law, Kansas
- Published
- 1940
213. Psychology of Human Adjustment Lester D. Crow
- Author
-
Williams, Al
- Published
- 1968
214. Like It Is, November 13, 1983
- Author
-
John W. Ryan; William H. Hudnut; R. Dean Tice; Philip R. Sharp; Armour G. McDaniel Sr.; Robert B. Adams; Dave Hutchenson [sic]; Howard D. Mehlinger; Robert B. Hanni; Robert D. Orr; Harold H. Negley; John W. Sweezy; Amy S. Bradley; Stanley P. Strader; Beverly Mukes-Gaither; John J. Sullivan; Carl E. Radford Jr.; Glenn L. Howard; Ronald Reed; Linda K. Hatch; Gordon K. Durnil; Joseph M. Perilli; Larry D. Paul; Charles R. Williams; Al "The Bishop" Hobbs and John W. Ryan; William H. Hudnut; R. Dean Tice; Philip R. Sharp; Armour G. McDaniel Sr.; Robert B. Adams; Dave Hutchenson [sic]; Howard D. Mehlinger; Robert B. Hanni; Robert D. Orr; Harold H. Negley; John W. Sweezy; Amy S. Bradley; Stanley P. Strader; Beverly Mukes-Gaither; John J. Sullivan; Carl E. Radford Jr.; Glenn L. Howard; Ronald Reed; Linda K. Hatch; Gordon K. Durnil; Joseph M. Perilli; Larry D. Paul; Charles R. Williams; Al "The Bishop" Hobbs
- Abstract
This audio recording of WTLC's news radio show Like It Is details a Veterans Day parade, a second part in a series on military service including an interview with one of the Tuskegee Airmen, a technology-focused job training center at IU, recommendations for the reform of the state education system, the results of a recent election, a reflection on Black voter turnout, neighborhood revitalizations, an increase in burglaries, and efforts by the American Lung Association to help smokers quit.
215. Like It Is, November 13, 1983 (Transcript)
- Author
-
John W. Ryan; William H. Hudnut; R. Dean Tice; Philip R. Sharp; Armour G. McDaniel Sr.; Robert B. Adams; Dave Hutchenson [sic]; Howard D. Mehlinger; Robert B. Hanni; Robert D. Orr; Harold H. Negley; John W. Sweezy; Amy S. Bradley; Stanley P. Strader; Beverly Mukes-Gaither; John J. Sullivan; Carl E. Radford Jr.; Glenn L. Howard; Ronald Reed; Linda K. Hatch; Gordon K. Durnil; Joseph M. Perilli; Larry D. Paul; Charles R. Williams; Al "The Bishop" Hobbs and John W. Ryan; William H. Hudnut; R. Dean Tice; Philip R. Sharp; Armour G. McDaniel Sr.; Robert B. Adams; Dave Hutchenson [sic]; Howard D. Mehlinger; Robert B. Hanni; Robert D. Orr; Harold H. Negley; John W. Sweezy; Amy S. Bradley; Stanley P. Strader; Beverly Mukes-Gaither; John J. Sullivan; Carl E. Radford Jr.; Glenn L. Howard; Ronald Reed; Linda K. Hatch; Gordon K. Durnil; Joseph M. Perilli; Larry D. Paul; Charles R. Williams; Al "The Bishop" Hobbs
- Abstract
This audio recording transcript of WTLC's news radio show Like It Is details a Veterans Day parade, a second part in a series on military service including an interview with one of the Tuskegee Airmen, a technology-focused job training center at IU, recommendations for the reform of the state education system, the results of a recent election, a reflection on Black voter turnout, neighborhood revitalizations, an increase in burglaries, and efforts by the American Lung Association to help smokers quit.
216. Like It Is, January 26, 1986
- Author
-
Raiford "Ossie" C. Davis; Pearlie M. Bible; Richard I. Blankenbaker; Charles R. Williams; Al "The Bishop" Hobbs; Arthur Johnson Jr.; Kim Ledbetter; Melinda S. Rider; Mervyn F. Silverman; George R. Irvine; Jon Masland; Motlalepula Chabaku; Peter H. Kostmayer; Andrew Jacobs Jr.; Al J. Golato and Raiford "Ossie" C. Davis; Pearlie M. Bible; Richard I. Blankenbaker; Charles R. Williams; Al "The Bishop" Hobbs; Arthur Johnson Jr.; Kim Ledbetter; Melinda S. Rider; Mervyn F. Silverman; George R. Irvine; Jon Masland; Motlalepula Chabaku; Peter H. Kostmayer; Andrew Jacobs Jr.; Al J. Golato
- Abstract
This audio recording of WTLC's news radio show Like It Is details accusations of police brutality in a drug arrest, awards presented to community leaders in honor of Dr. Martin Luther King Jr.'s birthday including statements by the mother of DeWayne Bible, an interview with writer and actor Ossie Davis; the thirteenth anniversary of Roe v. Wade, a discussion of AIDS in Indiana and San Francisco, an interview with activist Motlalepula Chabaku on apartheid, statements from a congressional delegation returning from South Africa including a note on Libya, a poll on a death penalty, updates on the Pacers, and the start of tax season.
217. Flowering, seed production and seed mass in a species rich temperate grassland exposed to FACE and warming
- Author
-
Hovenden, MJ, Wills, KE, Vander Schoor, JK, Chaplin, RE, Williams, AL, Nolan, MJ, Newton, PCD, Hovenden, MJ, Wills, KE, Vander Schoor, JK, Chaplin, RE, Williams, AL, Nolan, MJ, and Newton, PCD
- Abstract
Long term effects of climate change on plant communities must be mediated by reproductive and recruitment responses of component species. From spring 2003 until autumn 2006, we monitored flowering and seed production responses to free air CO2 enrichment (FACE) and 2ºC warming in a species-rich, nutrient-poor southern temperate grassland using the TasFACE experiment. There were no effects of either FACE or warming on the proportion of species flowering in any year. Flowering, seed production and seed mass were not significantly affected by FACE, warming or their interaction in most species. Some species, however, did respond significantly to simulated global changes. These responses generally were not governed by life history, but there were two distinct trends. Firstly, warming increased the proportion of the population that flowered in perennial grasses but not in other species types. Secondly, flowering and seed production of both perennial woody dicots responded strongly to the interaction of FACE and warming with Bossiaea prostrata producing most seeds in warmed FACE plots and Hibbertia hirsuta producing the most in unwarmed FACE plots. FACE increased seed mass four fold in the perennial C3 grass Elymus scaber (P<0.01) but substantially reduced seed mass of the perennial C3 grass Austrodanthonia caespitosa (P<0.02) and the perennial forb Hypochaeris radicata (P<0.02), with the remainder of species unaffected. Our results indicate that warming and elevated CO2 had little effect on seed production in the temperate grassland ecosystem. The few significant affects there were, however, are likely to have substantial implications for community composition and structure.
218. Flowering phenology in a species-rich temperate grassland is sensitive to warming but not elevated CO2
- Author
-
Hovenden, MJ, Wills, KE, Vander Schoor, JK, Williams, AL, Newton, PCD, Hovenden, MJ, Wills, KE, Vander Schoor, JK, Williams, AL, and Newton, PCD
- Abstract
Flowering is a critical stage in plant life cycles, and changes might alter processes at the species, community and ecosystem levels. Therefore likely flowering-time responses to global change drivers are needed for predictions of global change impacts on natural and managed ecosystems. Here we report the impact of elevated [CO2] (550 mol mol-1) and warming (+2ºC) on flowering times in a native, species-rich, temperate grassland in Tasmania, Australia in both 2004 and 2005. Elevated [CO2] did not affect average time of first flowering in either year, only affecting 3 out of 23 species. Warming reduced time to first flowering by an average of 19.1 days in 2004, acting on most species, but did not significantly alter flowering time in 2005, which might be related to the timing of rainfall. Elevated [CO2] and warming treatments did not interact on flowering time. These results show elevated [CO2] did not alter average flowering time or duration in this grassland, nor did it alter the response to warming. Therefore, flowering phenology appears insensitive to increasing [CO2] in this ecosystem although the response to warming varies between years but can be strong.
219. Warming and elevated CO2 affect the relationship between seed mass, germinability and seedling growth in Austrodanthonia caespitosa, a dominant Australian grass
- Author
-
Hovenden, MJ, Wills, KE, Chaplin, RE, Vander Schoor, JK, Williams, AL, Osanai, Y, Newton, PCD, Hovenden, MJ, Wills, KE, Chaplin, RE, Vander Schoor, JK, Williams, AL, Osanai, Y, and Newton, PCD
- Abstract
While the influence of elevated CO2 on the production, mass and quality of plant seeds has been well studied, the effect of warming on these characters is largely unknown and there is practically no information on possible interactions between warming and elevated CO2, despite the importance of these characters to population maintenance and recovery. Here we present the impacts of elevated CO2 and warming, both in isolation and combination, on seed production, mass, quality, germination success and subsequent seedling growth of Austrodanthonia caespitosa a dominant temperate C3 grass from Australia, using seeds collected from the TasFACE experiment. Mean seed production and mass were not significantly affected by either elevated CO2 or warming but elevated CO2 more than doubled the proportion of very light, inviable seeds (P<0.05) and halved mean seed N concentration (P<0.04) and N content (P<0.03). The dependence of seed germination success on seed mass was affected by an elevated CO2 warming interaction (P<0.004), such that maternal exposure to elevated CO2 or warming reduced germination if applied in isolation but not when applied in combination. Maternal effects were retained when seedlings were grown in a common environment for six weeks, with seedlings descended from warmed plants 20% smaller (P<0.008) with a higher root:shoot ratio (P<0.001) than those from unwarmed plants. Given that both elevated CO2 and warming reduced seed mass, quality, germinability or seedling growth, it is likely that global change will reduce population growth or distribution of this dominant species.
220. Warming prevents the elevated CO2-induced reduction in available soil nitrogen in a temperate, perennial grassland
- Author
-
Hovenden, MJ, Newton, PCD, Carran, RA, Theobald, P, Wills, KE, Vander Schoor, JK, Williams, AL, Osanai, Y, Hovenden, MJ, Newton, PCD, Carran, RA, Theobald, P, Wills, KE, Vander Schoor, JK, Williams, AL, and Osanai, Y
- Abstract
Rising atmospheric carbon dioxide concentration ([CO2]) has the potential to stimulate ecosystem productivity and sink strength, reducing the effects of carbon emissions on climate. In terrestrial ecosystems, increasing [CO2] can reduce soil nitrogen (N) availability to plants, preventing the stimulation of ecosystem carbon assimilation; a process known as progressive nitrogen limitation. Using ion exchange membranes to assess the availability of dissolved organic N, ammonium and nitrate, we found that CO2 enrichment in an Australian, temperate, perennial grassland did reduce soil N availability, mostly by reducing nitrate availability. Importantly, the addition of 2ºC warming prevented this effect while warming without CO2 enrichment did not significantly affect N availability. These findings indicate that global warming plays an important role in the impact of [CO2] on ecosystem N cycling, potentially overturning CO2-induced effects, with consequences for ecosystem productivity and carbon sequestration. Keywords: elevated CO2, FACE, progressive nitrogen limitation, warming, biogeochemistry
221. Warming and free-air CO2 enrichment alter demographics in four co-occurring grassland species
- Author
-
Williams, AL, Wills, KE, Janes, JK, Vander Schoor, JK, Newton, PCD, Hovenden, MJ, Williams, AL, Wills, KE, Janes, JK, Vander Schoor, JK, Newton, PCD, and Hovenden, MJ
- Abstract
Species differ in their responses to global changes like rising CO2 and temperature meaning that global changes are likely to change the structure of plant communities. Such alterations in community composition must be underlain by changes in the population dynamics of component species. Here we report the impact of elevated CO2 (550 mol mol-1) and warming (+2ºC) on population growth of four plant species important in Australian temperate grasslands. We analysed data collected from the TasFACE experiment between 2003 and 2006 using population matrix models. Population growth of Themeda triandra, a perennial C4 grass, was largely unaffected by either factor but population growth of Austrodanthonia caespitosa, a perennial C3 grass, was reduced substantially in elevated CO2 plots. Warming and elevated CO2 had antagonistic effects on population growth of two invasive weeds, Hypochaeris radicata and Leontodon taraxacoides, with warming causing population decline. Analysis of life cycle stages showed that seed production, seedling emergence and establishment were important factors in the species’ responses to global changes. These results show that the demographic approach is very useful in understanding the variable responses of plants to global changes and elucidating the life cycle stages most responsive.
222. Warming prevents the elevated CO2-induced reduction in available soil nitrogen in a temperate, perennial grassland
- Author
-
Hovenden, MJ, Newton, PCD, Carran, RA, Theobald, P, Wills, KE, Vander Schoor, JK, Williams, AL, Osanai, Y, Hovenden, MJ, Newton, PCD, Carran, RA, Theobald, P, Wills, KE, Vander Schoor, JK, Williams, AL, and Osanai, Y
- Abstract
Rising atmospheric carbon dioxide concentration ([CO2]) has the potential to stimulate ecosystem productivity and sink strength, reducing the effects of carbon emissions on climate. In terrestrial ecosystems, increasing [CO2] can reduce soil nitrogen (N) availability to plants, preventing the stimulation of ecosystem carbon assimilation; a process known as progressive nitrogen limitation. Using ion exchange membranes to assess the availability of dissolved organic N, ammonium and nitrate, we found that CO2 enrichment in an Australian, temperate, perennial grassland did reduce soil N availability, mostly by reducing nitrate availability. Importantly, the addition of 2ºC warming prevented this effect while warming without CO2 enrichment did not significantly affect N availability. These findings indicate that global warming plays an important role in the impact of [CO2] on ecosystem N cycling, potentially overturning CO2-induced effects, with consequences for ecosystem productivity and carbon sequestration. Keywords: elevated CO2, FACE, progressive nitrogen limitation, warming, biogeochemistry
223. Flowering, seed production and seed mass in a species rich temperate grassland exposed to FACE and warming
- Author
-
Hovenden, MJ, Wills, KE, Vander Schoor, JK, Chaplin, RE, Williams, AL, Nolan, MJ, Newton, PCD, Hovenden, MJ, Wills, KE, Vander Schoor, JK, Chaplin, RE, Williams, AL, Nolan, MJ, and Newton, PCD
- Abstract
Long term effects of climate change on plant communities must be mediated by reproductive and recruitment responses of component species. From spring 2003 until autumn 2006, we monitored flowering and seed production responses to free air CO2 enrichment (FACE) and 2ºC warming in a species-rich, nutrient-poor southern temperate grassland using the TasFACE experiment. There were no effects of either FACE or warming on the proportion of species flowering in any year. Flowering, seed production and seed mass were not significantly affected by FACE, warming or their interaction in most species. Some species, however, did respond significantly to simulated global changes. These responses generally were not governed by life history, but there were two distinct trends. Firstly, warming increased the proportion of the population that flowered in perennial grasses but not in other species types. Secondly, flowering and seed production of both perennial woody dicots responded strongly to the interaction of FACE and warming with Bossiaea prostrata producing most seeds in warmed FACE plots and Hibbertia hirsuta producing the most in unwarmed FACE plots. FACE increased seed mass four fold in the perennial C3 grass Elymus scaber (P<0.01) but substantially reduced seed mass of the perennial C3 grass Austrodanthonia caespitosa (P<0.02) and the perennial forb Hypochaeris radicata (P<0.02), with the remainder of species unaffected. Our results indicate that warming and elevated CO2 had little effect on seed production in the temperate grassland ecosystem. The few significant affects there were, however, are likely to have substantial implications for community composition and structure.
224. Warming and elevated CO2 affect the relationship between seed mass, germinability and seedling growth in Austrodanthonia caespitosa, a dominant Australian grass
- Author
-
Hovenden, MJ, Wills, KE, Chaplin, RE, Vander Schoor, JK, Williams, AL, Osanai, Y, Newton, PCD, Hovenden, MJ, Wills, KE, Chaplin, RE, Vander Schoor, JK, Williams, AL, Osanai, Y, and Newton, PCD
- Abstract
While the influence of elevated CO2 on the production, mass and quality of plant seeds has been well studied, the effect of warming on these characters is largely unknown and there is practically no information on possible interactions between warming and elevated CO2, despite the importance of these characters to population maintenance and recovery. Here we present the impacts of elevated CO2 and warming, both in isolation and combination, on seed production, mass, quality, germination success and subsequent seedling growth of Austrodanthonia caespitosa a dominant temperate C3 grass from Australia, using seeds collected from the TasFACE experiment. Mean seed production and mass were not significantly affected by either elevated CO2 or warming but elevated CO2 more than doubled the proportion of very light, inviable seeds (P<0.05) and halved mean seed N concentration (P<0.04) and N content (P<0.03). The dependence of seed germination success on seed mass was affected by an elevated CO2 warming interaction (P<0.004), such that maternal exposure to elevated CO2 or warming reduced germination if applied in isolation but not when applied in combination. Maternal effects were retained when seedlings were grown in a common environment for six weeks, with seedlings descended from warmed plants 20% smaller (P<0.008) with a higher root:shoot ratio (P<0.001) than those from unwarmed plants. Given that both elevated CO2 and warming reduced seed mass, quality, germinability or seedling growth, it is likely that global change will reduce population growth or distribution of this dominant species.
225. Warming and free-air CO2 enrichment alter demographics in four co-occurring grassland species
- Author
-
Williams, AL, Wills, KE, Janes, JK, Vander Schoor, JK, Newton, PCD, Hovenden, MJ, Williams, AL, Wills, KE, Janes, JK, Vander Schoor, JK, Newton, PCD, and Hovenden, MJ
- Abstract
Species differ in their responses to global changes like rising CO2 and temperature meaning that global changes are likely to change the structure of plant communities. Such alterations in community composition must be underlain by changes in the population dynamics of component species. Here we report the impact of elevated CO2 (550 mol mol-1) and warming (+2ºC) on population growth of four plant species important in Australian temperate grasslands. We analysed data collected from the TasFACE experiment between 2003 and 2006 using population matrix models. Population growth of Themeda triandra, a perennial C4 grass, was largely unaffected by either factor but population growth of Austrodanthonia caespitosa, a perennial C3 grass, was reduced substantially in elevated CO2 plots. Warming and elevated CO2 had antagonistic effects on population growth of two invasive weeds, Hypochaeris radicata and Leontodon taraxacoides, with warming causing population decline. Analysis of life cycle stages showed that seed production, seedling emergence and establishment were important factors in the species’ responses to global changes. These results show that the demographic approach is very useful in understanding the variable responses of plants to global changes and elucidating the life cycle stages most responsive.
226. Flowering phenology in a species-rich temperate grassland is sensitive to warming but not elevated CO2
- Author
-
Hovenden, MJ, Wills, KE, Vander Schoor, JK, Williams, AL, Newton, PCD, Hovenden, MJ, Wills, KE, Vander Schoor, JK, Williams, AL, and Newton, PCD
- Abstract
Flowering is a critical stage in plant life cycles, and changes might alter processes at the species, community and ecosystem levels. Therefore likely flowering-time responses to global change drivers are needed for predictions of global change impacts on natural and managed ecosystems. Here we report the impact of elevated [CO2] (550 mol mol-1) and warming (+2ºC) on flowering times in a native, species-rich, temperate grassland in Tasmania, Australia in both 2004 and 2005. Elevated [CO2] did not affect average time of first flowering in either year, only affecting 3 out of 23 species. Warming reduced time to first flowering by an average of 19.1 days in 2004, acting on most species, but did not significantly alter flowering time in 2005, which might be related to the timing of rainfall. Elevated [CO2] and warming treatments did not interact on flowering time. These results show elevated [CO2] did not alter average flowering time or duration in this grassland, nor did it alter the response to warming. Therefore, flowering phenology appears insensitive to increasing [CO2] in this ecosystem although the response to warming varies between years but can be strong.
227. Warming prevents the elevated CO2-induced reduction in available soil nitrogen in a temperate, perennial grassland
- Author
-
Hovenden, MJ, Newton, PCD, Carran, RA, Theobald, P, Wills, KE, Vander Schoor, JK, Williams, AL, Osanai, Y, Hovenden, MJ, Newton, PCD, Carran, RA, Theobald, P, Wills, KE, Vander Schoor, JK, Williams, AL, and Osanai, Y
- Abstract
Rising atmospheric carbon dioxide concentration ([CO2]) has the potential to stimulate ecosystem productivity and sink strength, reducing the effects of carbon emissions on climate. In terrestrial ecosystems, increasing [CO2] can reduce soil nitrogen (N) availability to plants, preventing the stimulation of ecosystem carbon assimilation; a process known as progressive nitrogen limitation. Using ion exchange membranes to assess the availability of dissolved organic N, ammonium and nitrate, we found that CO2 enrichment in an Australian, temperate, perennial grassland did reduce soil N availability, mostly by reducing nitrate availability. Importantly, the addition of 2ºC warming prevented this effect while warming without CO2 enrichment did not significantly affect N availability. These findings indicate that global warming plays an important role in the impact of [CO2] on ecosystem N cycling, potentially overturning CO2-induced effects, with consequences for ecosystem productivity and carbon sequestration. Keywords: elevated CO2, FACE, progressive nitrogen limitation, warming, biogeochemistry
228. Flowering phenology in a species-rich temperate grassland is sensitive to warming but not elevated CO2
- Author
-
Hovenden, MJ, Wills, KE, Vander Schoor, JK, Williams, AL, Newton, PCD, Hovenden, MJ, Wills, KE, Vander Schoor, JK, Williams, AL, and Newton, PCD
- Abstract
Flowering is a critical stage in plant life cycles, and changes might alter processes at the species, community and ecosystem levels. Therefore likely flowering-time responses to global change drivers are needed for predictions of global change impacts on natural and managed ecosystems. Here we report the impact of elevated [CO2] (550 mol mol-1) and warming (+2ºC) on flowering times in a native, species-rich, temperate grassland in Tasmania, Australia in both 2004 and 2005. Elevated [CO2] did not affect average time of first flowering in either year, only affecting 3 out of 23 species. Warming reduced time to first flowering by an average of 19.1 days in 2004, acting on most species, but did not significantly alter flowering time in 2005, which might be related to the timing of rainfall. Elevated [CO2] and warming treatments did not interact on flowering time. These results show elevated [CO2] did not alter average flowering time or duration in this grassland, nor did it alter the response to warming. Therefore, flowering phenology appears insensitive to increasing [CO2] in this ecosystem although the response to warming varies between years but can be strong.
229. Flowering, seed production and seed mass in a species rich temperate grassland exposed to FACE and warming
- Author
-
Hovenden, MJ, Wills, KE, Vander Schoor, JK, Chaplin, RE, Williams, AL, Nolan, MJ, Newton, PCD, Hovenden, MJ, Wills, KE, Vander Schoor, JK, Chaplin, RE, Williams, AL, Nolan, MJ, and Newton, PCD
- Abstract
Long term effects of climate change on plant communities must be mediated by reproductive and recruitment responses of component species. From spring 2003 until autumn 2006, we monitored flowering and seed production responses to free air CO2 enrichment (FACE) and 2ºC warming in a species-rich, nutrient-poor southern temperate grassland using the TasFACE experiment. There were no effects of either FACE or warming on the proportion of species flowering in any year. Flowering, seed production and seed mass were not significantly affected by FACE, warming or their interaction in most species. Some species, however, did respond significantly to simulated global changes. These responses generally were not governed by life history, but there were two distinct trends. Firstly, warming increased the proportion of the population that flowered in perennial grasses but not in other species types. Secondly, flowering and seed production of both perennial woody dicots responded strongly to the interaction of FACE and warming with Bossiaea prostrata producing most seeds in warmed FACE plots and Hibbertia hirsuta producing the most in unwarmed FACE plots. FACE increased seed mass four fold in the perennial C3 grass Elymus scaber (P<0.01) but substantially reduced seed mass of the perennial C3 grass Austrodanthonia caespitosa (P<0.02) and the perennial forb Hypochaeris radicata (P<0.02), with the remainder of species unaffected. Our results indicate that warming and elevated CO2 had little effect on seed production in the temperate grassland ecosystem. The few significant affects there were, however, are likely to have substantial implications for community composition and structure.
230. Warming and free-air CO2 enrichment alter demographics in four co-occurring grassland species
- Author
-
Williams, AL, Wills, KE, Janes, JK, Vander Schoor, JK, Newton, PCD, Hovenden, MJ, Williams, AL, Wills, KE, Janes, JK, Vander Schoor, JK, Newton, PCD, and Hovenden, MJ
- Abstract
Species differ in their responses to global changes like rising CO2 and temperature meaning that global changes are likely to change the structure of plant communities. Such alterations in community composition must be underlain by changes in the population dynamics of component species. Here we report the impact of elevated CO2 (550 mol mol-1) and warming (+2ºC) on population growth of four plant species important in Australian temperate grasslands. We analysed data collected from the TasFACE experiment between 2003 and 2006 using population matrix models. Population growth of Themeda triandra, a perennial C4 grass, was largely unaffected by either factor but population growth of Austrodanthonia caespitosa, a perennial C3 grass, was reduced substantially in elevated CO2 plots. Warming and elevated CO2 had antagonistic effects on population growth of two invasive weeds, Hypochaeris radicata and Leontodon taraxacoides, with warming causing population decline. Analysis of life cycle stages showed that seed production, seedling emergence and establishment were important factors in the species’ responses to global changes. These results show that the demographic approach is very useful in understanding the variable responses of plants to global changes and elucidating the life cycle stages most responsive.
231. Warming and elevated CO2 affect the relationship between seed mass, germinability and seedling growth in Austrodanthonia caespitosa, a dominant Australian grass
- Author
-
Hovenden, MJ, Wills, KE, Chaplin, RE, Vander Schoor, JK, Williams, AL, Osanai, Y, Newton, PCD, Hovenden, MJ, Wills, KE, Chaplin, RE, Vander Schoor, JK, Williams, AL, Osanai, Y, and Newton, PCD
- Abstract
While the influence of elevated CO2 on the production, mass and quality of plant seeds has been well studied, the effect of warming on these characters is largely unknown and there is practically no information on possible interactions between warming and elevated CO2, despite the importance of these characters to population maintenance and recovery. Here we present the impacts of elevated CO2 and warming, both in isolation and combination, on seed production, mass, quality, germination success and subsequent seedling growth of Austrodanthonia caespitosa a dominant temperate C3 grass from Australia, using seeds collected from the TasFACE experiment. Mean seed production and mass were not significantly affected by either elevated CO2 or warming but elevated CO2 more than doubled the proportion of very light, inviable seeds (P<0.05) and halved mean seed N concentration (P<0.04) and N content (P<0.03). The dependence of seed germination success on seed mass was affected by an elevated CO2 warming interaction (P<0.004), such that maternal exposure to elevated CO2 or warming reduced germination if applied in isolation but not when applied in combination. Maternal effects were retained when seedlings were grown in a common environment for six weeks, with seedlings descended from warmed plants 20% smaller (P<0.008) with a higher root:shoot ratio (P<0.001) than those from unwarmed plants. Given that both elevated CO2 and warming reduced seed mass, quality, germinability or seedling growth, it is likely that global change will reduce population growth or distribution of this dominant species.
232. Flowering, seed production and seed mass in a species rich temperate grassland exposed to FACE and warming
- Author
-
Hovenden, MJ, Wills, KE, Vander Schoor, JK, Chaplin, RE, Williams, AL, Nolan, MJ, Newton, PCD, Hovenden, MJ, Wills, KE, Vander Schoor, JK, Chaplin, RE, Williams, AL, Nolan, MJ, and Newton, PCD
- Abstract
Long term effects of climate change on plant communities must be mediated by reproductive and recruitment responses of component species. From spring 2003 until autumn 2006, we monitored flowering and seed production responses to free air CO2 enrichment (FACE) and 2ºC warming in a species-rich, nutrient-poor southern temperate grassland using the TasFACE experiment. There were no effects of either FACE or warming on the proportion of species flowering in any year. Flowering, seed production and seed mass were not significantly affected by FACE, warming or their interaction in most species. Some species, however, did respond significantly to simulated global changes. These responses generally were not governed by life history, but there were two distinct trends. Firstly, warming increased the proportion of the population that flowered in perennial grasses but not in other species types. Secondly, flowering and seed production of both perennial woody dicots responded strongly to the interaction of FACE and warming with Bossiaea prostrata producing most seeds in warmed FACE plots and Hibbertia hirsuta producing the most in unwarmed FACE plots. FACE increased seed mass four fold in the perennial C3 grass Elymus scaber (P<0.01) but substantially reduced seed mass of the perennial C3 grass Austrodanthonia caespitosa (P<0.02) and the perennial forb Hypochaeris radicata (P<0.02), with the remainder of species unaffected. Our results indicate that warming and elevated CO2 had little effect on seed production in the temperate grassland ecosystem. The few significant affects there were, however, are likely to have substantial implications for community composition and structure.
233. Flowering phenology in a species-rich temperate grassland is sensitive to warming but not elevated CO2
- Author
-
Hovenden, MJ, Wills, KE, Vander Schoor, JK, Williams, AL, Newton, PCD, Hovenden, MJ, Wills, KE, Vander Schoor, JK, Williams, AL, and Newton, PCD
- Abstract
Flowering is a critical stage in plant life cycles, and changes might alter processes at the species, community and ecosystem levels. Therefore likely flowering-time responses to global change drivers are needed for predictions of global change impacts on natural and managed ecosystems. Here we report the impact of elevated [CO2] (550 mol mol-1) and warming (+2ºC) on flowering times in a native, species-rich, temperate grassland in Tasmania, Australia in both 2004 and 2005. Elevated [CO2] did not affect average time of first flowering in either year, only affecting 3 out of 23 species. Warming reduced time to first flowering by an average of 19.1 days in 2004, acting on most species, but did not significantly alter flowering time in 2005, which might be related to the timing of rainfall. Elevated [CO2] and warming treatments did not interact on flowering time. These results show elevated [CO2] did not alter average flowering time or duration in this grassland, nor did it alter the response to warming. Therefore, flowering phenology appears insensitive to increasing [CO2] in this ecosystem although the response to warming varies between years but can be strong.
234. Warming and free-air CO2 enrichment alter demographics in four co-occurring grassland species
- Author
-
Williams, AL, Wills, KE, Janes, JK, Vander Schoor, JK, Newton, PCD, Hovenden, MJ, Williams, AL, Wills, KE, Janes, JK, Vander Schoor, JK, Newton, PCD, and Hovenden, MJ
- Abstract
Species differ in their responses to global changes like rising CO2 and temperature meaning that global changes are likely to change the structure of plant communities. Such alterations in community composition must be underlain by changes in the population dynamics of component species. Here we report the impact of elevated CO2 (550 mol mol-1) and warming (+2ºC) on population growth of four plant species important in Australian temperate grasslands. We analysed data collected from the TasFACE experiment between 2003 and 2006 using population matrix models. Population growth of Themeda triandra, a perennial C4 grass, was largely unaffected by either factor but population growth of Austrodanthonia caespitosa, a perennial C3 grass, was reduced substantially in elevated CO2 plots. Warming and elevated CO2 had antagonistic effects on population growth of two invasive weeds, Hypochaeris radicata and Leontodon taraxacoides, with warming causing population decline. Analysis of life cycle stages showed that seed production, seedling emergence and establishment were important factors in the species’ responses to global changes. These results show that the demographic approach is very useful in understanding the variable responses of plants to global changes and elucidating the life cycle stages most responsive.
235. Warming prevents the elevated CO2-induced reduction in available soil nitrogen in a temperate, perennial grassland
- Author
-
Hovenden, MJ, Newton, PCD, Carran, RA, Theobald, P, Wills, KE, Vander Schoor, JK, Williams, AL, Osanai, Y, Hovenden, MJ, Newton, PCD, Carran, RA, Theobald, P, Wills, KE, Vander Schoor, JK, Williams, AL, and Osanai, Y
- Abstract
Rising atmospheric carbon dioxide concentration ([CO2]) has the potential to stimulate ecosystem productivity and sink strength, reducing the effects of carbon emissions on climate. In terrestrial ecosystems, increasing [CO2] can reduce soil nitrogen (N) availability to plants, preventing the stimulation of ecosystem carbon assimilation; a process known as progressive nitrogen limitation. Using ion exchange membranes to assess the availability of dissolved organic N, ammonium and nitrate, we found that CO2 enrichment in an Australian, temperate, perennial grassland did reduce soil N availability, mostly by reducing nitrate availability. Importantly, the addition of 2ºC warming prevented this effect while warming without CO2 enrichment did not significantly affect N availability. These findings indicate that global warming plays an important role in the impact of [CO2] on ecosystem N cycling, potentially overturning CO2-induced effects, with consequences for ecosystem productivity and carbon sequestration. Keywords: elevated CO2, FACE, progressive nitrogen limitation, warming, biogeochemistry
236. Warming and elevated CO2 affect the relationship between seed mass, germinability and seedling growth in Austrodanthonia caespitosa, a dominant Australian grass
- Author
-
Hovenden, MJ, Wills, KE, Chaplin, RE, Vander Schoor, JK, Williams, AL, Osanai, Y, Newton, PCD, Hovenden, MJ, Wills, KE, Chaplin, RE, Vander Schoor, JK, Williams, AL, Osanai, Y, and Newton, PCD
- Abstract
While the influence of elevated CO2 on the production, mass and quality of plant seeds has been well studied, the effect of warming on these characters is largely unknown and there is practically no information on possible interactions between warming and elevated CO2, despite the importance of these characters to population maintenance and recovery. Here we present the impacts of elevated CO2 and warming, both in isolation and combination, on seed production, mass, quality, germination success and subsequent seedling growth of Austrodanthonia caespitosa a dominant temperate C3 grass from Australia, using seeds collected from the TasFACE experiment. Mean seed production and mass were not significantly affected by either elevated CO2 or warming but elevated CO2 more than doubled the proportion of very light, inviable seeds (P<0.05) and halved mean seed N concentration (P<0.04) and N content (P<0.03). The dependence of seed germination success on seed mass was affected by an elevated CO2 warming interaction (P<0.004), such that maternal exposure to elevated CO2 or warming reduced germination if applied in isolation but not when applied in combination. Maternal effects were retained when seedlings were grown in a common environment for six weeks, with seedlings descended from warmed plants 20% smaller (P<0.008) with a higher root:shoot ratio (P<0.001) than those from unwarmed plants. Given that both elevated CO2 and warming reduced seed mass, quality, germinability or seedling growth, it is likely that global change will reduce population growth or distribution of this dominant species.
237. Reference to the index of Oscar Jones, Solicitor of Murdoch and Jones, Queenstown branch, 1896-1902.
- Author
-
Jones, Oscar, Williams, AL, Page, Charles, Murdoch, George, Jones, Oscar, Williams, AL, Page, Charles, and Murdoch, George
- Abstract
Papers of Oscar Jones, solicitor of Murdoch & Jones Queenstown branch and his predecessor AL Williams, apparently found at Strathelie, formerly the Jones family home. The papers are business papers of the Queenstown branch of solicitors Murdoch & Jones, formerly Williams & Page, including mine share business. There are also a few personal papers of AL Williams and of Oscar Jones.The Queenstown practice was established by AL Williams in 1896. Later Charles Page became a partner and established an office at Zeehan. George Murdoch of the Stone Buildings, Hobart, later Murdoch and Jones, acted as Hobart agent and early in 1898 the two firms merged as Williams and Page of Hobart, Queenstown and Zeehan. In April 1899, however, Williams sold out to Murdoch and Jones, Oscar Jones managed the Queenstown branch and by July the firm's name was changed to Murdoch & Jones. Williams & Page remained in Zeehan, under C.S. Page.
238. Reference to the index of Oscar Jones, Solicitor of Murdoch and Jones, Queenstown branch, 1896-1902.
- Author
-
Jones, Oscar, Williams, AL, Page, Charles, Murdoch, George, Jones, Oscar, Williams, AL, Page, Charles, and Murdoch, George
- Abstract
Papers of Oscar Jones, solicitor of Murdoch & Jones Queenstown branch and his predecessor AL Williams, apparently found at Strathelie, formerly the Jones family home. The papers are business papers of the Queenstown branch of solicitors Murdoch & Jones, formerly Williams & Page, including mine share business. There are also a few personal papers of AL Williams and of Oscar Jones.The Queenstown practice was established by AL Williams in 1896. Later Charles Page became a partner and established an office at Zeehan. George Murdoch of the Stone Buildings, Hobart, later Murdoch and Jones, acted as Hobart agent and early in 1898 the two firms merged as Williams and Page of Hobart, Queenstown and Zeehan. In April 1899, however, Williams sold out to Murdoch and Jones, Oscar Jones managed the Queenstown branch and by July the firm's name was changed to Murdoch & Jones. Williams & Page remained in Zeehan, under C.S. Page.
239. Reference to the index of Oscar Jones, Solicitor of Murdoch and Jones, Queenstown branch, 1896-1902.
- Author
-
Jones, Oscar, Williams, AL, Page, Charles, Murdoch, George, Jones, Oscar, Williams, AL, Page, Charles, and Murdoch, George
- Abstract
Papers of Oscar Jones, solicitor of Murdoch & Jones Queenstown branch and his predecessor AL Williams, apparently found at Strathelie, formerly the Jones family home. The papers are business papers of the Queenstown branch of solicitors Murdoch & Jones, formerly Williams & Page, including mine share business. There are also a few personal papers of AL Williams and of Oscar Jones.The Queenstown practice was established by AL Williams in 1896. Later Charles Page became a partner and established an office at Zeehan. George Murdoch of the Stone Buildings, Hobart, later Murdoch and Jones, acted as Hobart agent and early in 1898 the two firms merged as Williams and Page of Hobart, Queenstown and Zeehan. In April 1899, however, Williams sold out to Murdoch and Jones, Oscar Jones managed the Queenstown branch and by July the firm's name was changed to Murdoch & Jones. Williams & Page remained in Zeehan, under C.S. Page.
240. Reference to the index of Oscar Jones, Solicitor of Murdoch and Jones, Queenstown branch, 1896-1902.
- Author
-
Jones, Oscar, Williams, AL, Page, Charles, Murdoch, George, Jones, Oscar, Williams, AL, Page, Charles, and Murdoch, George
- Abstract
Papers of Oscar Jones, solicitor of Murdoch & Jones Queenstown branch and his predecessor AL Williams, apparently found at Strathelie, formerly the Jones family home. The papers are business papers of the Queenstown branch of solicitors Murdoch & Jones, formerly Williams & Page, including mine share business. There are also a few personal papers of AL Williams and of Oscar Jones.The Queenstown practice was established by AL Williams in 1896. Later Charles Page became a partner and established an office at Zeehan. George Murdoch of the Stone Buildings, Hobart, later Murdoch and Jones, acted as Hobart agent and early in 1898 the two firms merged as Williams and Page of Hobart, Queenstown and Zeehan. In April 1899, however, Williams sold out to Murdoch and Jones, Oscar Jones managed the Queenstown branch and by July the firm's name was changed to Murdoch & Jones. Williams & Page remained in Zeehan, under C.S. Page.
241. Recognizing the empty sella by CT: the infundibulum sign
- Author
-
Haughton, VM, primary, Rosenbaum, AE, additional, Williams, AL, additional, and Drayer, B, additional
- Published
- 1981
- Full Text
- View/download PDF
242. CT resolution and diagnostic accuracy
- Author
-
Williams, AL, primary and Haughton, VM, additional
- Published
- 1979
- Full Text
- View/download PDF
243. Differentiation of intramedullary neoplasms and cysts by MR
- Author
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Williams, AL, primary, Haughton, VM, additional, Pojunas, KW, additional, Daniels, DL, additional, and Kilgore, DP, additional
- Published
- 1987
- Full Text
- View/download PDF
244. Orbital apex: correlative anatomic and CT study
- Author
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Daniels, DL, primary, Pech, P, additional, Kay, MC, additional, Pojunas, K, additional, Williams, AL, additional, and Haughton, VM, additional
- Published
- 1985
- Full Text
- View/download PDF
245. CT recognition of lateral lumbar disk herniation
- Author
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Williams, AL, primary, Haughton, VM, additional, Daniels, DL, additional, and Thornton, RS, additional
- Published
- 1982
- Full Text
- View/download PDF
246. Severity of postmyelographic arachnoiditis and concentration of meglumine locarmate in primates
- Author
-
Haughton, VM, primary, Ho, KC, additional, Unger, GF, additional, Larson, SJ, additional, Williams, AL, additional, and Eldevik, P, additional
- Published
- 1978
- Full Text
- View/download PDF
247. Contrast enhancement in spinal MR imaging
- Author
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Breger, RK, primary, Williams, AL, additional, Daniels, DL, additional, Czervionke, LF, additional, Mark, LP, additional, Haughton, VM, additional, Papke, RA, additional, and Coffer, M, additional
- Published
- 1989
- Full Text
- View/download PDF
248. Magnetic resonance imaging of the cavernous sinus
- Author
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Daniels, DL, primary, Pech, P, additional, Mark, L, additional, Pojunas, K, additional, Williams, AL, additional, and Haughton, VM, additional
- Published
- 1985
- Full Text
- View/download PDF
249. Jugular foramen: anatomic and computed tomographic study
- Author
-
Daniels, DL, primary, Williams, AL, additional, and Haughton, VM, additional
- Published
- 1984
- Full Text
- View/download PDF
250. MR detection of tumor in the internal auditory canal
- Author
-
Daniels, DL, primary, Millen, SJ, additional, Meyer, GA, additional, Pojunas, KW, additional, Kilgore, DP, additional, Shaffer, KA, additional, Williams, AL, additional, and Haughton, VM, additional
- Published
- 1987
- Full Text
- View/download PDF
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