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Marchessault RH, Bluhm TL, Deslandes Y, Hamer GK, Orts WJ, Sundararajan PR, Taylor MG, Bloembergen S, Holden DA. Poly(β-hydroxyalkanoates): Biorefinery polymers in search of applications. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/masy.19880190120] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
We developed a new and simple method to collect sections of a whole brown rice kernel for investigation of histological properties. A single kernel of rice was dehydrated through a graded ethanol series, transferred to xylene, and embedded in paraffin. During sectioning of the blocks using a rotary microtome, we used a special adhesive tape to collect and place the sections on slides so they remained flat. The use of the adhesive tape technique combined with autofluorescence characteristics allowed us to visualize cell walls throughout an entire longitudinal or transverse section of a whole rice kernel. We obtained scanning electron microscopy images of the sections to determine section quality.
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Affiliation(s)
- Y Ogawa
- USDA, ARS, Western Regional Research Center, 800 Buchanan Street, Albany, CA 94710, USA
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Mattoso LHC, Medeiros ES, Baker DA, Avloni J, Wood DF, Orts WJ. Electrically conductive nanocomposites made from cellulose nanofibrils and polyaniline. J Nanosci Nanotechnol 2009; 9:2917-2922. [PMID: 19452949 DOI: 10.1166/jnn.2009.dk24] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Electrically conductive nanocomposites from cellulose nanofibrils (CNF) were successfully produced by in situ polymerization of aniline onto CNF, and studied by open circuit potential (Voc), four probe direct current (dc) electrical conductivity, ultraviolet-visible (UV-Vis) spectroscopy and scanning electron microscopy (SEM). The oxidative polymerization of aniline using ammonium peroxydisulfate in hydrochloric acid aqueous solutions was realized by the addition of nanofibrils leading to an aqueous suspension of CNF coated with polyaniline (PANI). This procedure lead to stable, green suspensions of CNF coated with PANI in the emeraldine oxidation state as demonstrated by Voc and UV-Vis analyses. Electrically conductive films of this cellulose nanocomposite could be cast from aqueous solutions with conductivity close to the conducting polymer, yet with the potential for more useful flexible films.
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Affiliation(s)
- L H C Mattoso
- Laboratório Nacional de Nanotecnologia Aplicada ao Agronegócio, Embrapa Instrumentação Agropecuária, Rua XV de Novembro, 1452, São Carlos-SP 13560-970, Brazil
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Sojka RE, Entry JA, Orts WJ, Morishita DW, Ross CW, Horne DJ. Synthetic- and bio-polymer use for runoff water quality management in irrigated agriculture. Water Sci Technol 2005; 51:107-115. [PMID: 15850180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Low concentrations of synthetic- or bio-polymers in irrigation water can nearly eliminate sediment, N, ortho- and total-P, DOM, pesticides, micro-organisms, and weed seed from runoff. These environmentally safe polymers are employed in various sensitive uses including food processing, animal feeds, and potable water purification. The most common synthetic polymer is anionic, high purity polyacrylamide (PAM), which typically provides 70-90% contaminant elimination. Excellent results are achieved adding only 10 ppm PAM to irrigation water, applying 1-2 kg ha(-1) per irrigation, costing 4 dollars - 12 dollars kg(-1). Biopolymers are less effective. Using twice or higher concentrations, existing biopolymers are approximately 60% effective as PAM, at 2-3 times the cost. A half million ha of US irrigated land use PAM for erosion control and runoff protection. The practice is spreading rapidly in the US and worldwide. Interest in development of biopolymer surrogates for PAM is high. If the supply of cheap natural gas (raw material for PAM synthesis) diminishes, industries may seek alternative polymers. Also "green" perceptions and preferences favor biopolymers for certain applications.
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Affiliation(s)
- R E Sojka
- USDA-ARS-NWISRL, 3793 N. 3600 E., Kimberly, ID 83341-5076, USA
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Orts WJ, Romansky M, Guillet JE. Measurement of the crystallinity of poly(β-hydroxybutyrate-co-β-hydroxyvalerate) copolymers by inverse gas chromatography. Macromolecules 2002. [DOI: 10.1021/ma00028a068] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Affiliation(s)
- A. P. Klamczynski
- United States Department of Agriculture-ARS-Western Regional Research Center, 800 Buchanan St., Albany, CA 94710. Names are necessary to report factually on available data; however, the USDA neither guaranties nor warrants the standard of the product, and the use of the USDA implies no approval of the product to the exclusion of others that may also be suitable
- Corresponding author. Phone (510) 559-5742. Fax: (510) 559-5936. E-mail:
| | - G. M. Glenn
- United States Department of Agriculture-ARS-Western Regional Research Center, 800 Buchanan St., Albany, CA 94710. Names are necessary to report factually on available data; however, the USDA neither guaranties nor warrants the standard of the product, and the use of the USDA implies no approval of the product to the exclusion of others that may also be suitable
| | - W. J. Orts
- United States Department of Agriculture-ARS-Western Regional Research Center, 800 Buchanan St., Albany, CA 94710. Names are necessary to report factually on available data; however, the USDA neither guaranties nor warrants the standard of the product, and the use of the USDA implies no approval of the product to the exclusion of others that may also be suitable
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Affiliation(s)
- W. J. Orts
- USDA-ARS, Western Regional Research Center, 800 Buchanan Street, Albany, CA 94710. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable
- Corresponding author: Phone: 510-559-5730. Fax: 510-559-5936. E-mail:
| | - G. M. Glenn
- USDA-ARS, Western Regional Research Center, 800 Buchanan Street, Albany, CA 94710. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable
| | - G. A. R. Nobes
- USDA-ARS, Western Regional Research Center, 800 Buchanan Street, Albany, CA 94710. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable
| | - D. F. Wood
- USDA-ARS, Western Regional Research Center, 800 Buchanan Street, Albany, CA 94710. Names are necessary to report factually on available data; however, the USDA neither guarantees nor warrants the standard of the product, and the use of the name by the USDA implies no approval of the product to the exclusion of others that may also be suitable
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Abstract
Volatiles were obtained from commercially prepared and laboratory-prepared rice cakes using high-flow dynamic headspace isolation with Tenax trapping. Analysis was carried out by capillary GC/MS. More than 60 compounds were identified. Major volatiles included 1-hydroxy-2-propanone, furfuryl alcohol, 2, 5-dimethylpyrazine, 2-methylpyrazine, pyrazine, hexanal, furfural, pentanol, 3-hydroxy-2-butanone (acetoin), and ethyl-3, 6-dimethylpyrazine. Although not ideally applicable to a dry product, concentration/threshold ratios indicated that the compounds with a high probability of contributing to the aroma and flavor included 3-methylbutanal, dimethyl trisulfide, 2-ethyl-3,5-dimethylpyrazine, 4-vinylguaiacol, hexanal, (E,E)-2,4-decadienal, 2-methylbutanal, 2-acetyl-1-pyrroline, 1-octen-3-ol, and 1-octen-3-one.
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Affiliation(s)
- R G Buttery
- Western Regional Research Center, Agricultural Research Service, U.S. Department of Agriculture, Albany, California 94710, USA
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Orts WJ, Godbout L, Marchessault RH, Revol JF. Enhanced Ordering of Liquid Crystalline Suspensions of Cellulose Microfibrils: A Small Angle Neutron Scattering Study. Macromolecules 1998. [DOI: 10.1021/ma9711452] [Citation(s) in RCA: 215] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Glinka CJ, Barker JG, Hammouda B, Krueger S, Moyer JJ, Orts WJ. The 30 m Small-Angle Neutron Scattering Instruments at the National Institute of Standards and Technology. J Appl Crystallogr 1998. [DOI: 10.1107/s0021889897017020] [Citation(s) in RCA: 559] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Murthy NS, Akkapeddi MK, Orts WJ. Analysis of Lamellar Structure in Semicrystalline Polymers by Studying the Absorption of Water and Ethylene Glycol in Nylons Using Small-Angle Neutron Scattering. Macromolecules 1998. [DOI: 10.1021/ma9707603] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- N. S. Murthy
- Engineered Materials Sector Research Laboratories, AlliedSignal Inc., Morristown, New Jersey 07962
| | - M. K. Akkapeddi
- Engineered Materials Sector Research Laboratories, AlliedSignal Inc., Morristown, New Jersey 07962
| | - W. J. Orts
- USDA-ARS, Western Regional Research Center, CPU-800 Buchanan Street, Albany, California 94710
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Krueger S, Koenig BW, Orts WJ, Berk NF, Majkrzak CF, Gawrisch K. Neutron reflectivity studies of single lipid bilayers supported on planar substrates. Basic Life Sci 1996; 64:205-13. [PMID: 9031513 DOI: 10.1007/978-1-4615-5847-7_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Neutron reflectivity was used to probe the structure of single phosphatidylcholine (PC) lipid bilayers adsorbed onto a planar silicon surface in an aqueous environment. Fluctuations in the neutron scattering length density profiles perpendicular to the silicon/water interface were determined for different lipids as a function of the hydrocarbon chain length. The lipids were studied in both the gel and liquid crystalline phases by monitoring changes in the specularly-reflected neutron intensity as a function of temperature. Contrast variation of the neutron scattering length density was applied to both the lipid and the solvent. Scattering length density profiles were determined using both model-independent and model-dependent fitting methods. During the reflectivity measurements, a novel experimental set-up was implemented to decrease the incoherent background scattering due to the solvent. Thus, the reflectivity was measured to Q approximately 0.3 A-1, covering up to seven orders of magnitude in reflected intensity, for PC bilayers in D2O and silicon-matched (38% D2O/62% H2O) water. The kinetics of lipid adsorption at the silicon/water interface were also explored by observing changes in the reflectivity at low Q values under silicon-matched water conditions.
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Affiliation(s)
- S Krueger
- National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
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Murthy NS, Orts WJ. Hydration in semicrystalline polymers: Small-angle neutron scattering studies of the effect of drawing in nylon-6 fibers. ACTA ACUST UNITED AC 1994. [DOI: 10.1002/polb.1994.090321615] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Orts WJ, Wu W, Satija SK. Observation of temperature dependent thicknesses in ultrathin polystyrene films on silicon. Phys Rev Lett 1993; 71:867-870. [PMID: 10055388 DOI: 10.1103/physrevlett.71.867] [Citation(s) in RCA: 106] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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