142,264 research outputs found
Paul N. Saunders Oral History
No full textAn interview of the Washington University Medical Center Desegregation History Project, conducted by Edwin W. McCleskey and associates, 1990. Approximate Length: 64 minutes.
Paul Saunders discusses the suit he and others filed against Barnes Hospital in 1978 for civil rights violations, as well as the state of health care policy and health care for Black people in St. Louis.
Saunders discusses the policy for “geographic separation of patients” at Barnes Hospital’s Maternity Hospital, initiated by hospital director Robert Frank in 1978, and the suit Saunders and others filed with the Missouri Department of Health, Education, and Welfare.
He addresses hospital policies and procedures which create informal segregation, and the effects of white flight on medical care in St. Louis, particularly for indigent patients. He discusses the need for national health insurance, and barriers created by the current health care system for Black patients
Saunders Theatre Program collection, 1914-1964
No full textThis collection contains programs and newsclipping reviews of various theatrical performances appearing in Little Rock between 1914-1962. Programs include plays, minstrel shows, movies, vaudeville shows, operas, musicals, recitals, concerts, follies, revues, local amateur shows, lectures, ballets, magic shows, readings, etc. These shows were performed by both local groups and traveling troupes. Theatres include the Kempner, Little Rock High School, and Robinson Auditorium. The newsclipping reviews are from the Arkansas Gazette, Arkansas Democrat, and the Memphis Commercial Appeal (traveling troupe usually played in Memphis before coming to Little Rock). Also included are two notebooks by Saunders: 1) List of performances at the Kempner and Robinson Auditorium, 1917-1958, and (2) personal reviews of performances, 1926-1933. There are programs (i.e., New York, Chicago, St. Louis, etc.) from performances Saunders attended in other cities. The collection also contains two scrapbooks, c. 1900-1913 covering early moving pictures and movie stars, and theatrical performances in St. Louis, Missouri. The scrapbooks were started by Mattie Dicks, mother-in-law of Earl Saunders. They were continued by Margarite Dicks Saunders while her family lived in St. Louis before moving to Little Rock.UALR.0104 A-107
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16 flat boxes. 1914-1964. Donated Revised May 2009 jlm This collection contains programs and newsclipping reviews of various theatrical performances appearing in Little Rock between 1914-1962. Programs include plays, minstrel shows, movies, vaudeville shows, operas, musicals, recitals, concerts, follies, revues, local amateur shows, lectures, ballets, magic shows, readings, etc. These shows were performed by both local groups and traveling troupes. Theatres include the Kempner, Little Rock High School, and Robinson Auditorium. The newsclipping reviews are from the Arkansas Gazette, Arkansas Democrat, and the Memphis Commercial Appeal (traveling troupe usually played in Memphis before coming to Little Rock). Also included are two notebooks by Saunders: 1) List of performances at the Kempner and Robinson Auditorium, 1917-1958, and (2) personal reviews of performances, 1926-1933. There are programs (i.e., New York, Chicago, St. Louis, etc.) from performances Saunders attended in other cities. The collection also contains two scrapbooks, c. 1900-1913 covering early moving pictures and movie stars, and theatrical performances in St. Louis, Missouri. The scrapbooks were started by Mattie Dicks, mother-in-law of Earl Saunders. They were continued by Margarite Dicks Saunders while her family lived in St. Louis before moving to Little Rock. Born in Stuttgart, Arkansas October 20, 1892, Earl Saunders, Sr. was raised in Little Rock. Saunders married Margarite Dicks and they had one son, Earl Saunders, Jr. After working for Becks, a retail store, Saunders joined the S. M. Brooks Advertising firm. He became vice-president and stayed with the company 44 years until his death May 2, 1962. One of his responsibilities at S. M. Brooks Advertising was to prepare the programs for the theatrical performances appearing in Little Rock. Saunders served as President of the Young Business men's Association, Director of the 10th District Federation of America Advertising, and Director of the Salvation Army Board. His life-long infatuation with the circus and theatre is best characterized by his habit of watching the circus trains unload at 3:00 in the morning and his booking of four seats on the second row of every show which came to Little Rock. Arrangement: Chronological BOX TITLES Box 1 1914-1919. 119 items. [Kempner Theatre] Includes minstrel shows (black and white), plays, movies, concerts, opera, local revues, vaudeville, musicals. Note: 1914-1915 theatre season list (no programs); no programs or reviews for 1916 season. Box 2 1920-1921. 133 items. [Kempner Theatre] UALR.0104 A-107
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Includes plays, minstrel shows, operas, recitals, local revues. Box 3 1922-1923. 140 items. [Kempner Theatre] Includes minstrel shows, negro troupes, plays, musicals, local minstrels, recitals, concerts. Box 4 1924-1925. 117 items. [Kempner Theatre] Includes minstrel shows, plays, concerts, musicals, local revues, follies, dance recitals. Box 5 1926-1927. 71 items. [Kempner Theatre] Includes minstrel shows, plays, musicals, movies, concerts, variety acts. Box 6 1928-1933, 1928 n.d. 96 items. [Kempner Theatre and Little Rock High School] Includes concerts, minstrel shows, plays, vanities, musicals, Olga Worth Players. Box 7 1934-1941. 94 items. [Little Rock High School, Community Theatre, Robinson Auditorium] Includes plays, operas, recitals, concerts, ballets, lectures, local amateur shows. Box 8 1941-1943. 64 items. [Robinson Auditorium] Includes concerts, recitals, plays, ballets, musicals, character sketches, operas. Box 9 1944-1947. 120 items. [Robinson Auditorium] Includes plays, concerts, recitals, operas, dances, magic shows, musicals. Box 10 1948-1951. 110 items. [Robinson Auditorium] Includes musicals, concerts, plays, recitals, ballets. UALR.0104 A-107
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Box 11 1952-1955. 98 items. [Robinson Auditorium] Includes concerts, recitals, ballets, local minstrels, musicals, plays, dances, readings. Box 12 1956-1960. 126 items. [Robinson Auditorium] Includes concerts, plays, local minstrels, operas, musicals, ballets, magic shows. Box 13 1961-1962, n.d. 57 items. [Robinson Auditorium] Includes plays, concerts, ballets, musicals, operas, local minstrels, movies. Box 14 n.d. 21 items. Notebooks: (1) list of performances at the Kempner and Robinson Auditorium, 1917-1958; (2) personal reviews of performances 1926-1933; Non-Little Rock Programs: New York, Chicago, St. Louis, Oklahoma City; Theatre Arts Monthly. Box 15 Scrapbook 1900-1905. 1 item Newsclippings: photos, reviews, society column, poetry, ballads, obituaries; magazine clippings; programs: operas, plays. Box 16 Scrapbook 1911-1913 The Morning Telegraph, New York: photos anecdotes. Colored photos from programs UALR.0104 A-107
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Theatre Season List: 1917-1925
1917 Jan. 17 "Katinka" Feb. 1 Neil O'Brien Minstrels Feb. 6 Sarah Bernhardt in a series of sketches including "Camille" Feb. 15 Julian Etinge in "Cousin Lucy" Feb. 26 Cyril Maude in "Grumpy" March 7 Tom Powell's Mintrels March 9 "Florabella" with Florence Webber March 12-14 "Daughter of the Gods" with Annette Kellerman (movie) March 26-29 "Intolerance" (movie) April 11 "It Pays to Advertise" April 16-17 Boathouse Revue (local) April 23-25 Little Rock Music Festival with St. Louis Symphony Orchestra, Oscar Seagle (5 concerts) May 21 Margaret Wilson (Pres. Wilson's daughter) soprano (reviews only) Oct. 8 "My People" (Negro Troupe) Oct. 10 Al H. Wilson in "The Irish 15th" Oct. 20 Mitzi Hajos in "Pom-Pom" with Detmar Poppen Oct. 29-30 "Experience" Oct. 31-Nov. 1 "Nothing But the Truth" Nov. 5-6 "Cheating Cheaters" Nov. 13 "The Garden of Allah" Nov. 26-28 Al G. Field Minstrels Dec. 3-4 "Ben Hur" Dec. 5 "Twin Beds" Dec. 12 "You're In Love" Dec. 25 "Chin Chin" with Doyle and Dixon 1918 Jan. 1 Harry Lauder program Jan. 8 "Oh, Boy" Jan. 19 "My Soldier Girl" Jan. 30 Neil O'Brien's Minstrels March 9 "The Bird of Paradise" March n.d. "Have a Heart" March n.d. "Everywoman" March n.d. "Fair and Warmer" Nov. 25-27 Al G. Field Minstrels Dec. 5 "Watch Your Step" UALR.0104 A-107
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1919 Jan. n.d. "The Boomerang" Jan. 13 "Pollyanna" Feb. n.d. Neil O'Brien Minstrel Feb. 26 David Warfield in "The Auctioneer" March 5 "Daddy Longlegs" March 12 "Have a Heart" March 14 "Flo-Flo" March 17-19 Shrine Minstrels March 20 "Pom-Pom" March n.d. Creatore Opera Company in "Carmen" and "Aida" April 14 "Chin Chin" April 16 "Friendly Enemies" May 28-29 Elks Minstrels (local) August n.d. Julian Eltinge Vaudeville Revue Oct. 23 "Scandal" with Emma Bunting Oct. 29 "Going Up" Oct. 30 "Leave It to Jane" Nov. 1, 3 "Aida" and "Madame Butterfly" Chicago Opera Company with Sophie Braslau, Desire Defree, Emma Noe, Rosa Raisa (Camp Pike Theater) Nov. 6 Adelaide Thurston in "What's Your Game?" Nov. 12 "The Boomerang" Nov. 13 Mitzi Hajos in "Head Over Heels" n.d. Gus Hill's Minstrels n.d. "Up in Mabel's Room" Dec. 18 "Tea For Three" 1920 Jan. 1 "Sleeping Partners" Jan. 7 "Tiger Rose" Jan. 9 "Somebody's Sweetheart" Jan. 14 Fritzi Scheff in "Glorianna" with Al Wilson Feb. 4 "Listen Lester" Feb. 11-12 "Up in Mabel's Room" Feb. 18 Neil O'Brien's Minstrels March 3 DeWolff Hopper in "The Better 'Ole" with Harry McNaughty March 4 "Business Before Pleasure" with Harry Bannister March 11 "The Chocolate Soldier" March 25-27 Al G. Field Minstrels March 29 May Irwin in "On the Hiring Line" April 7-8 American Legion Minstrels April 21 "Turn to the Right" with Sylvia Field Oct. 4-5 "Robin Hood" Oct. 6 "Hitchy-Koo" Oct. 19 "Up in Mabel's Room" (missing) UALR.0104 A-107
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Oct. 20-21 Minnie Maddern Fiske in "Mis' Nell of N' Orleans" Oct. 27 "The Mikado" Nov. 3-4 "The Rainbow Girl" Nov. 10-11 "Nightie Night" Nov. 15 Dunbar's White Hussar Band (reviews only) Nov. 22-24 Al G. Field Minstrels Dec. 1 Carlye Blackwell in "My Lady Friends" Dec. 2 "The Old Homestead" Dec. 7-8 Walker Whiteside in "The Master of Bllantrae" Dec. 13-15 Sonora Opera Company in "Il TrobatoreCavalleriaPagliacci" and "Faust" Dec. 22-23 "The Girl in the Limousine" with Emma Bunting Dec. 24-25 Lou Tellegen in "Blind Youth" Dec. 29-30 "Buddies" Dec. 31 "Georgia Minstrels" 1921 Jan. 5-6 "Irene" Jan. 17 Ruth St. Dnis dancers Jan. n.d. Marcus Show of 1920 Jan. 26-27 McIntyre and Heath in "Hello, Alexander" Feb. 2-3 "The Passing Show" Feb. 11 "Adam and Eva" (reviews only) Feb. 14-16 Al Amin Temple Minstrels Feb. n.d. "The Bird of Paradise" Feb. n.d. "Common Clay" Feb. n.d. "Experience" Feb. 18-19 Neil O'Brien Minstrels March 1-2 "Mary" March 10 "Three Wise Fools" with Claude Gillingwater, Helen Menken March 15-16 Al G. Field Minstrels March 21-23 "Lightnin'" March 24-26 "Stop Thief" April 26 "Taken In" with Henry Walthall May 25 "Travelers Review" (local) May 27 Mildred Reamey Dance Recital Aug. 23-26 "H.M.S. Pinafore" (local) Nov. 7 "Broadway Whirl of 1921" with Blanche Ring, Charles Winninger Nov. 8-9 Guy Bates Post in "The Masquerer" Nov. 21-23 Al G. Field Minstrels Dec. 1 "Listen Irene" Dec. 14 "Miss Lulu Bett" with Emma Bunting Dec. 29-30 DeWolf Hopper in "Erminie" UALR.0104 A-107
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1922 Jan. 7 Georgia Minstrel (Negro) (Palace Theatre) Jan. 9 Mamie Smith (Negro Troupe) (reviews only) Jan. 10-11 "Listen Lester" (Palace Theatre) Jan. 30 Lasses White's Minstrels (reviews only) Jan. 31-Feb. 1 Greenwich Village Follies Feb. 8-9 "Take It From Me" Feb. 13 "Lions Minstrel" (local) Feb. 14 Lasses White Minstrel Feb. 15-16 "Irene" Feb. 18 "Margie" Feb. 21 "Angel Face" Feb. 22-25 Shrine Show (local) March 7-8 "Chu-Chin-Chow" March 15 Neil O'Brien Minstrels March n.d. "Clarence" (Legion, local) March 27-28 Eagle Minstrel (local) March 28-29 Jean DuToit Little Theater (Hotel Marion Ballroom) April 12 Otis Skinner in "Blood and Sand" with Cornelia Otis Skinner April 13 Lou Tellegen in "Blind Youth" (reviews only) May 19 Mildred Reamey Dance Recital Oct. 2-4 Roses's Royal Midgets Oct. 11 Mitzi Hajos in "Lady Billy" Nov. 9-10 "The Merry Widow" with Jefferson DeAngelus Nov. 17 "Eve" Nov. 29-30 "The Bat" Nov. 25 Ukranian National Chorus Dec. 5 "Bringing Up Father" Dec. 6-7 Olga Petrova in "The White Peacock" Dec. 13-14 "The Cat and the Canary" Dec. 25-26 "The Circle" with Norman Hackett, Charlotte Walker, Wilton Lackaye, Amelia Bingham Dec. 27 Cornell Glee Club 1223 Jan. 6 "Up in the Clouds" Jan. 8 Fritz Leiber in "Macbeth" and "Hamlet" Jan. 12 "Greenwich Village Follies" Jan. 17-18 Lasses White's Mintrels Jan. 20 Walker Whiteside in "The Hindu" Jan. 24-25 "Tangerine" Feb. 3 "Mutt and Jeff" Feb. 4 "Greenwich Village Follies" (Shubert-Jefferson Theatre) Feb. 16 "Take It From Me" Feb. 27-28 "Shuffle Along" (Negro Troupe) UALR.0104 A-107
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March 1 "The Book of Job" Feb. 19-24 Richard's, "The Wizard" March 9 "The Gold Diggers" March 12-13 Lions Club Revue (local) March 15-17 "The Unloved Wife" March 19 Geraldine Farrar March 21-22 Al G. Field Minstrels March 30 Margaret Anglin in "The Woman of Bronze" April 2-3 Eagles Revue (local) April 12 Raymond Hitchcock in "Hitchy-Koo" Oct. 1-3 "The First Year" Oct. 11-13 "The Covered Wagon" movie Oct. 19-20 "Lightin'" with Thomas Jefferson Oct. 27 Irene Castle, dances and song Nov. 22 Lasses White's Minstels Nov. 24 "Bringing Up Father" Nov. 29-30 "Blossom Time" Dec. 6 Harry Lauder and Co. Dec. 7-8 "The Clinging Vine" Dec. 20 Georgia Minstrels Dec. 27-28 Crane Wilbur in "The Monster" Dec. 31 "Venus" musical revue 1924 Jan. 11-12 "Sue, Dear" Jan. 17 Lasses White Minstrels Jan. 18 "Good Morning, Dearie" Jan. 19 "Wildflower" Jan. 24-25 "The Fool" Jan. 29 "Blossom Time" Feb. 1-2 "Sally, Irene and Mary" Feb. 4 Juan Mannen, Violinist Feb. 5-6 "The Bat" Feb. 7 "The Gingham Girl" Feb. 7 Sousa and His Band (matinee) Feb. 11 "Up She Goes" Feb. 16 Frank Silver's Revue March 2 "Just Married" March 26027 Al G. Field Minstrels Oct. 22-25 "The Ten Commandments" Oct. 28 J.A. Coburn's Minstrels Oct. 29 "Meet the Wife" Nov. 17-18 Al G. Field Minstrels Nov. 29 "Models of 1925" Dec. 10 "Blossom Time" Dec. 12-13 Gallagher and Sean in "In Dutch" UALR.0104 A-107
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Dec. 17 "Foot-Loose" with William Faversham and Margaret Anglin Dec. 31 Lasses White's Minstrels 1925 Jan. 9-10 "Little Jesse James" Jan. 12-14 "Rain" Jan. 30 "Sally" Feb. 4 "Just Married" Feb. 6-7 "The Passing Show" with Georgie Price and Roy Cummings Feb. 10 "Blossom Time" Feb. 12 "The Cat and the Canary" Feb. 27-28 "The Unwanted Child" March 10 "White Cargo" March 12 Miriam McHaney, Hazel Brewer Toll March 1
A study of thermoassociative gelation of aqueous cationic poly(N-isopropyl acrylamide) graft copolymer solutions
No full textIn this work thermoassociative gel formation of a new family of aqueous temperature-responsive copolymer solutions has been investigated. This was achieved using a cationic poly(N-isopropyl acrylamide) (PNIPAm) graft copolymer recently prepared [Liu R, De Leonardis P, Cellesi F, Tirelli N, Saunders BR. Langmuir 2008;24:7099]. The PDMA+x-g-(PNIPAmn)y copolymers have x and y values that originate from the macroinitiator; the value for n corresponds to the PNIPAm arm length. DMA+ is quarternarized N,N-dimethylaminoethyl methacrylate. The copolymer solutions exhibited cloud point temperatures (Tclpt) of about 33 °C, which were not significantly affected by x/y ratio or the value for n. Thermoassociative gel formation occurred above Tclpt at copolymer concentrations (Ccopol) greater than or equal to 4 wt.%. This is a reasonably low Ccopol value and is a consequence of the graft copolymer architecture employed. We investigated the effect of temperature, Ccopol and copolymer structure on gelation and gel elasticity using variable - temperature dynamic rheology. For PDMA+30-g-(PNIPAm210)14 solutions at 39 °C it was found that G′ (elastic modulus) scales with Ccopol according to G′ ∼ Ccopol3.85. The data suggested that a significant proportion of PNIPAm units is not directly involved in network formation. Thermoassociative gel formation and the gel properties for these systems appear to be governed by a balance between electrostatic repulsion involving the DMA+ units (favouring spatial extension of the copolymer backbones) and attractive hydrophobic interactions between PNIPAm side chains (favouring associative crosslink formation). © 2009 Elsevier Ltd. All rights reserved
The comet march [music] /
No full text2nd ed. Cover title.; Dedicated to Gordon Saunders Esq -- p.1.; Also available online http://nla.gov.au/nla.mus-an6450271; MUS: N, GE93069.; Library's copy has publisher's label pasted over imprint: Wm. C. Daniel
Ontogeny and Phylogeny of Brain Barrier Mechanisms.
No full textThe brain functions within an internal environment that is determined and controlled by morphological structures and cellular mechanisms present at interfaces between the brain and the rest of the body. In vertebrates these interfaces are across cerebral blood vessels (blood-brain barrier) choroid plexuses (blood-cerebrospinal fluid barrier) and pia-arachnoid. There is a CSF-brain barrier in the neuroepithelium lining the ventricular system that is only present in embryos. There is now substantial evidence that many brain barrier mechanisms develop early and that in some cases they are functionally more active and even more specialized compared to adult barriers. Therefore barriers in developing brain should be viewed as adapted appropriately for the growing brain and not, as is still widely believed, immature. Considerable advances in our understanding of these barrier mechanisms have come from studies of the developing brain and invertebrates. A striking aspect, to be highlighted in this special edition, is that many of the molecular mechanisms in these very diverse species are similar despite differences in the cellular composition of the interfaces. This Frontiers Topic comprises articles in three sections: Original studies, Reviews and Myths & Misconceptions. Original articles provide new information on molecular and cellular barrier mechanisms in developing brains of primates, including human embryos (Brøchner et al., Ek et al., Errede et al.), rodents (Bauer et al., Liddelow, Strazielle & Ghersi-Egea, Saunders et al., Whish et al.), chick (Bueno et al.) and zebrafish (Henson et al.) as well as studies in drosophila (Hindle & Bainton, De Salvo et al., Limmer et al.). The Reviews section includes evolutionary perspectives of the blood-brain and blood-CSF barriers (Bueno et al., Bill & Korzh). There are also detailed reviews of the current state of understanding of different interfaces and their functional mechanisms in developing brain (Bauer et al., Strazielle & Gjersi-Egea, Liddelow, Richardson et al., Errede et al., Henson et al., Brøchner et al.) and in invertebrates (Hindle & Bainton, De Salvo et al., Limmer et al). Different aspects of the relationship between properties of the internal environment of the brain and its development are discussed. (Stolp & Molnar, Johansson, Prasongchean et al.). A neglected area, namely barriers over the surface of the brain during development is also covered (Brøchner et al.). Clinically related perspectives on barrier disruption in neonatal stroke are provided by Kratzer et al. and other aspects of dysfunction by Morretti et al. and by Palmeta et al. on the continuing problem of bilirubin toxicity. Progress in this field is hampered by many prevailing myths about barrier function, combined with methodologies that are not always appropriately selected or interpreted. These are covered in the Misconceptions, Myths and Methods section, including historical aspects and discussion of the paracellular pathway, a central dogma of epithelial and endothelial biology (Saunders et al.) and a review of markers used to define brain barrier integrity in development and in pathological conditions (Saunders et al.). Use of inappropriate markers has caused considerable confusion and unreliable interpretation in many published studies. Torbett et al. deal with the complexities of the new field of applying proteomics to understanding blood-brain barrier properties as do Huntley at al. with respect to applying modern high throughput gene expression methods (Huntley et al.). The Editorial summarizes the contributions from all authors. This includes mention of some the main unanswered but answerable questions in the field and what the impediments to progress may be
An empirical model of long-term thermospheric density change
No full textPredicting the positions of satellites in Low Earth Orbit (LEO) requires a comprehensive understanding of the dynamic nature of the atmosphere. For objects in LEO the most significant orbit perturbation is atmospheric drag, which is a function of the local atmospheric density from a layer in the atmosphere called the thermosphere. For long-term predictions of satellite orbits and ephemerides, any density trend in the thermosphere is a necessary consideration, not only for satellite operators, but also for studies of the future LEO environment in terms of space debris. Numerous studies of long-term thermospheric density change have been performed.Predictions by Roble & Ramesh (2002), along with evidence by Keating (2000), Emmert et al.(2004), Marcos et al. (2005), Qian et al. (2006) and Emmert et al. (2008), strongly suggest the existence of such a phenomenon. Therefore, the objective of the research presented in this thesis is to provide a novel method to evaluate quantitatively thermospheric density change. Satellite drag data is an effective medium through which one can investigate local thermospheric density and changes thereof. There are many ways of determining atmospheric density, but inferring thermospheric density from satellite drag data is a relatively cost-effective way of gathering in-situ measurements. To do this, knowledge about a satellite’s physical properties that are intrinsic to atmospheric drag is required. A study by Saunders et al. (2009) highlighted problems with estimating a satellite’s physical properties directly from data given explicitly by Two-Line Element (TLE) sets. This prompted an investigation into ways to estimate ballistic coefficients: a required satellite parameter associated with drag coefficient and area-to-mass ratio. A novel way of estimating satellite ballistic coefficients was derived and is presented in this thesis. Additionally, novel consideration of atmospheric chemical composition was applied on long-term drag coefficient variability. Using a quantitative estimate of a ballistic coefficient one can propagate numerically a satellite’s orbit and predict the effects of atmospheric drag. Given an initial satellite orbit from TLE data, one approach is to use an orbital propagator to predict the satellite’s state at some time ahead and then to compare that state with TLE data at the same epoch. The difference between the semi-major axes of the initial orbit and that after the orbit propagation is then integrated and can be used to estimate the global average density. The method employed in this study utilises this process. To achieve this, a specially developed, computer-based, numerical orbital propagator was written in the programming language C/C++. The underlying theories and implementation tests for this propagator are presented in this thesis
Temperature-Triggered Gelation of Aqueous Laponite Dispersions Containing a Cationic Poly(N-isopropyl acrylamide) Graft Copolymer
No full textIn this work, temperature-triggered gelation of aqueous laponite dispersions containing a cationic poly(N- isopropylacrylamide) (PNIPAm) graft copolymer was investigated. The copolymer used was PDMA+ 30-g-(PNIPAm210)14 [Liu et al. Langmuir 2008, 24, 7099]. DMA+ is quarternarized N,N-dimethylaminoethyl methacrylate. The presence of small concentrations of laponite enabled temperature-triggered gel formation to occur at low copolymer concentrations (e.g., 1 wt %). Dynamic Theological measurements of the gels showed that they had storage modulus values of up to 400 Pa when the total solid volume fraction (polymer and laponite) was only about 0.02. The storage modulus was dependent on both the temperature and the composition of the dispersion used for preparation. The key component that provided the temperature-triggered gels with their elasticity was found to be self-assembled nanocomposite (NC) sheets. These NC sheets spontaneously formed at room temperature upon addition of laponite to the copolymer solution. The NC sheets had lateral dimensions on the order of hundreds of micrometers and a thickness of a few micrometers. The NC sheets were present within the temperature-triggered gels and formed elastically effective chains. The NC sheets exhibited temperature-triggered contraction with a contraction onset temperature of 27 deg;C. A conceptual model is proposed to qualitatively explain the relationship between gel elasticity and dispersion composition. © 2009 American Chemical Society
Saunders Conservation Program
No full textPhotograph of William Saunders and R. N. Wall, SCS, Technician, planning a conservation program for his farm. The back of the photograph proclaims, "Saunders planning a conservation program for his farm, 5 miles southeast of Binger, assisted by SCS Technician R. N. Wall." The photograph does not specify which of the two men are William Saunders and R. N. Wall
Saunders Conservation Plan
No full textPhotograph of William Saunders and R. N. Wall, SCS, Technician, planning a conservation program for his farm. The back of the photograph proclaims, "Saunders planning a conservation program for his farm, 5 miles southeast of Binger, assisted by SCS Technician R. N. Wall." The photograph does not specify which of the two men are William Saunders and R. N. Wall
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