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Topic: Polyacrylamide

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	Polyacrylamide (PAM) and Soils
		Two polyacrylamide (PAM) compounds in which the NH2 was substituted with OH at 2% (2J) and 21% (21J), rendering them negatively charged, were used.
		The reverse trend was observed for the Na soil.
		Calcium inhibition of polyacrylamide gel hydration is partially reversible by potassium.
	www.nal.usda.gov /wqic/Bibliographies/eb9614.html (1746 words)

	Polyacrylamide - Wikipedia, the free encyclopedia
		Polyacrylamide is an acrylate polymer formed from acrylamide subunits that is readily cross-linked.
		Polyacrylamide is not toxic, but un-polymerized acrylamide can be present in the polymerized acrylamide.
		It is highly water-absorbent, forming a soft gel used in such applications as polyacrylamide gel electrophoresis and in manufacturing soft contact lenses.
	en.wikipedia.org /wiki/Polyacrylamide (162 words)

	Acrylamide (EHC 49, 1985)
		Polyacrylamides are useful as flocculents in the treatment of waste water and the purification of drinking-water.
		Polyacrylamide is a white, odourless solid, soluble in water, insoluble in solvents such as methanol, ethanol, and hexane, and at least 1% soluble in glycerol, ethyl acetate, glacial acetic acid, and lactic acid.
		Polyacrylamides are used as flocculents to separate solids from aqueous solutions in mining operations, in the disposal of industrial wastes, and in the purification of water supplies (Tilson, 1981).
	www.inchem.org /documents/ehc/ehc/ehc49.htm (15703 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		Additionally, the polyacrylamide reactive prepolymer used for crosslinking to obtain the polyacrylamide hydrogel is of sufficient viscosity that it can be employed in a commercial coating process.
		Thus the invention further optimally provides a method of preparing a polyacrylamide hydrogel array, that optimally comprises: (a) obtaining a polyacrylamide reactive prepolymer; (b) placing the polyacrylamide reactive prepolymer on a solid support in a pattern; and (c) crosslinking the polyacrylamide reactive prepolymer to obtain the polyacrylamide hydrogel array.
		A method of preparing a polyacrylamide hydrogel array comprising: (a) obtaining a polyacrylamide reactive prepolymer; (b) placing said polyacrylamide reactive prepolymer on a solid support in a pattern; and (c) crosslinking said polyacrylamide reactive prepolymer to obtain said polyacrylamide hydrogel array.
	www.wipo.int /cgi-pct/guest/getbykey5?KEY=00/31148.000602&ELEMENT_SET=DECL (8338 words)

	Polyacrylamide (Site not responding. Last check: 2007-10-20)
		Polyacrylamide is the same material that is used for skin electrodes and in soft contact lenses.
		Polyacrylamide gel may be prepared so as to provide a wide variety of electrophoretic conditions.
		Polyacrylamide gels can be cast in a single percentage or with varying gradients.
	www.bergen.org /AAST/Projects/Gel/poly.htm (190 words)

	Tramfloc, Inc. - Polyacrylamide found to reduce soil erosion in furrows by up to 99 percent.
		Using a combination of polyacrylamide and surge irrigation, erosion was reduced an average of 64 percent while using 25 percent less irrigation water and producing equal yields of 179 bushels per acre of grain corn when compared to untreated conventional irrigated corn in 1996-98.
		In 1997, soil loss was reduced 22 percent when polyacrylamide was applied on only 3 of 10 irrigations and total yield was significantly increased from 377 cwt/ac on the untreated control as compared to 425 cwt/ac on the polyacrylamide treated plots.
		Since polyacrylamide is a ultra potent flocculant, the sediment content of the ditch water was reduced as much as 67 percent, which partially sealed the ditch.
	www.tramfloc.com /tf153.html (887 words)

	Polyacrylamide is added to soil and pesticides, it may be a major problem? Prof. Joe Cummins / Department of Biology / ...
		Acrylamide is a building block for the polymer, polyacrylamide, a material used in genetics in molecular biology laboratories as a matrix for separating nucleic acid components during DNA sequence analysis and during protein identification.
		Of course polyacrylamide may be contaminated with its toxic building block, acrylamide, and for that reason a limit of 500ppm acrylamide in polyacrylamide preparations has been arbitrarily determined to be acceptable for use in agriculture or water treatment.
		Certainly, polyacrylamide residue levels in food crops should have been studied as soon as polyacrylamide began to be used in pesticide formulations and irrigation water and such residues should be studied in the future.
	www.mindfully.org /Pesticide/2002/Polyacrylamide-Soil-Pesticides-Cummins8aug02.htm (885 words)

	Polyacrylamide Gels (Site not responding. Last check: 2007-10-20)
		Polyacrylamide gels are used to analyze and prepare fragments of DNA less than 1 kb in length[107].
		They may be cast in a variety of polyacrylamide concentrations, ranging from 3.5% to 20%, depending on the sizes of the fragments of interest (see table tab:page).
		Polyacrylamide gels are most commonly poured between two glass plates that are held apart by spacers.
	www.uni-graz.at /~binder/thesis/node43.html (343 words)

	CHEST: Aspiration injury due to polyacrylamide - Selected Reports (Site not responding. Last check: 2007-10-20)
		Polyacrylamide is a synthetic polymer used widely in many types of liquid-solid separation procedures, water clarification, waste treatment, and mining.[1,2] Despite its extensive use in industry, little to no information is available regarding the hazards posed by polyacrylamide to the environment or public health if aspirated or accidentally ingested.
		Unfortunately; when the gel was subjected to GC/MS analysis, the polyacrylamide monomer did not register (probably reflecting its inert nature); when polyacrylamide was removed by centrifugation, and the suspending solvent was subjected to GC/MS analysis, the resulting pattern had the characteristics of a typical aliphatic hydrocarbon mixture which contained dodecane ([C.sub.2 H.sub.26]) as a component.
		We do not know which chemical component of the inhaled gel, aqueous polyacrylamide or its solvent, was responsible for the pulmonary injury; therefore, experimental studies in animals to further identify the injurious agent are in progress.
	www.findarticles.com /p/articles/mi_m0984/is_n2_v101/ai_12339479 (1255 words)

	Fast and Efficient Elution of Proteins from Polyacrylamide Gels Using Nanosep® Centrifugal Devices
		The polyacrylamide matrix tends to expand in solution trapping a considerable amount of protein, which reduces the final protein recovery; therefore, it is not the method of choice when working with the microquantities of protein required in most proteomic applications.
		The polyacrylamide gel slices acted as a physical barrier to the flow of elution buffer, decreasing the flow rate and, thus, the overall efficiency.
		Thus, the amount of polyacrylamide gel used in the procedure seems to be the most critical factor for efficient recovery, and, therefore, the number of centrifugal units used in each elution experiment should be determined empirically.
	www.pall.com /34696_2273.asp (1986 words)

	Kimberly ARS PAM Primer (Site not responding. Last check: 2007-10-20)
		Polyacrylamide treatment of irrigation water may be the fastest growing conservation technology in irrigated agriculture.
		Polyacrylamide (PAM) copolymer used, unless noted otherwise, was a dry granular material having an approximate molecular weight of 12-15 Mg/mole, with an 18% negative charge density, manufactured by CYTEC Industries of Wayne, NJ.
		In addition the large polyacrylamide molecule is slowly degraded by physical breakage due to mechanical forces such as abrasion, freeze-thaw action, and particle shrinking and swelling.
	kimberly.ars.usda.gov /Pamprim.shtml (7262 words)

	Polyacrylamide Gel Electrophoresis (PAGE) (Site not responding. Last check: 2007-10-20)
		Consequently, polyacrylamide gels can be used to separate molecules that differ in size by as little as 2% of their molecular weight.
		Polyacrylamide gels are difficult to prepare when compared with agarose gels and the risk associated with their preparation is much greater.
		Polyacrylamide gels are composed of two chemicals, monoacrylamide, and N,N' methylene bis acrylamide (usually abbreviated bis).
	biotech.nhctc.edu /BT210/tutorial10.html (1136 words)

	Effects of Polyacrylamide Application Method on Soil Erosion and Water Infiltration
		Polyacrylamide (PAM) applied to the irrigation water in small quantities has been shown to decrease the amount of sediment loss, as well as increase water infiltration into the soil in furrow-irrigated fields (Trout et.
		Polyacrylamide is a slightly water-soluble, high molecular weight, long chain polymer, that flocculates suspended soil particles.
		Polyacrylamide may be profitable to growers who use it, as they may not have to irrigate as often or for as long due to increased infiltration.
	www.cropinfo.net /AnnualReports/1995/granbpam.htm (1212 words)

	SDS POLYACRYLAMIDE GEL ELECTROPHORESIS (SDS-PAGE)
		In addition, the most commonly used support matrices - agarose and polyacrylamide - provide a means of separating molecules by size, in that they are porous gels.
		Because dilute agarose gels are generally more rigid and easy to handle than polyacrylamide of the same concentration, agarose is used to separate larger macromolecules such as nucleic acids, large proteins and protein complexes.
		Polyacrylamide, which is easy to handle and to make at higher concentrations, is used to separate most proteins and small oligonucleotides that require a small gel pore size for retardation.
	www.mcb.uct.ac.za /sdspage.html (1204 words)

	W0157: X-ray Diffraction from Proteins Crystallized in Polyacrylamide Gels (Site not responding. Last check: 2007-10-20)
		The feasibility of measuring the x-ray diffraction patterns from protein crystallites grown in polyacrylamide gels was investigated using the insertion device beamline and experiment facilities of the Structural Biology Center (Sector 19 at Argonne’s Advanced Photon Source (APS) facility).
		Coupling this technique with the development of combinatorial methods for protein crystallization within the purification matrix and the use of synchrotron x rays from a high-brilliance source such as the APS would provide a rapid tool for screening hundreds of proteins for optimal crystallization conditions.
		Polyacrylamide gels were cast as cylinders of approximately 7 mm in diameter and 5 mm in height.
	www.hwi.buffalo.edu /ACA/ACA99/abstracts/text/W0157.html (403 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		Acrylamide is a building block for the polymer, polyacrylamide, a material well-known in molecular biology laboratories as a gel matrix for resolving DNA fragments in sequence analysis and identifying proteins, both under electric fields.
		Strangely, the WHO releases did not mention the fact that polyacrylamide is a well known additive to commercial herbicide mixtures (25% to 30% solutions) to reduce spray drift and to act as a surfactant [2].
		The evidence seems compelling, therefore, that acrylamide is being released from polyacrylamide in the environment, one of the main sources of which is in glyphosate herbicide formulations.
	www.connectotel.com /gmfood/is010802.txt (460 words)

	Polyacrylamide – A Method to Reduce Soil Erosion, G98-1356-A
		Polyacrylamide (PAM) is a long-chain synthetic polymer that acts as a strengthening agent, binding soil particles together.
		Because polyacrylamide attaches to the soil particles and binds them together, water containing a lot of sediment may result in sediment settling out before water is diverted into the furrows.
		Polyacrylamide can control soil erosion that occurs with irrigation; however, like many farming practices, its use, effectiveness and economic return varies from field to field.
	ianrpubs.unl.edu /water/g1356.htm (3346 words)

	Environmental Degradation of Polyacrylamides II. Effects of Environmental (Outdoor) Exposure Ecotoxicology and ...
		Among their various uses, polyacrylamides are mixed with various organic solvents to form thickening agents that are then combined with herbicides (i.e., glyphosate) to increase the herbicides’ surfactant capabilities (Bouse et al., 1986).
		Therefore, the objective of this study is to examine the environmental fate of a polyacrylamide thickening agent, alone and in combination with a herbicide, under environmental (outdoor) conditions.
		Polyacrylamide is primarily composed of C-C, C-H, and C-N bonds.
	mindfully.org /Plastic/Polymers/Polyacrylamides-Degradation1jun97.htm (6419 words)

	UseofPAM
		In erosion polyacrylamides, the PAM homopolymer is copolymerized.
		Polyacrylamide as an organic nitrogen source for soil microorganisms with potential impact on inorganic soil nitrogen in agricultural soil.
		Polyacrylamide to improve water flow and salt removal in a high shrink-swell soil.
	www.naicc.org /Meeting/2001/UseofPAM.html (4485 words)

	INFLUENCE OF POLYACRYLAMIDE ON PHYSICAL PROPERTIES OF A PEAT-PERLITE MIX AND ON THE GROWTH OF ARGYRANTHEMUM ...
		Polyacrylamide addition at the highest rate (10g/l) decreased dry bulk density and air content and increased total pore space, water retained at suctions of 1, 5 and 10 kPa and not easily available water.
		Relative water content of containers with plants after irrigation and drainage increased with increasing rates of polyacrylamide; this effect was progressively decreasing and became undetectable after a culture period of two months.
		Shoot and total biomass was not significantly affected by polyacrylamide but treated plants showed an increase on root dry weight and a decrease in the shoot to root ratio.
	www.actahort.org /books/554/554_4.htm (279 words)

	ARS \| Publication request: Polyacrylamide for Coliform Bacteria Removal from Agricultural Wastewater
		Fecal coliforms in soil were greater in the 0-5 and 5-15 cm soil depths when waste was applied to soil regardless of soil polyacrylamide treatment.
		Polyacrylamide may not provide additional protection to surface water from waste applied to ungrazed forage production systems, but the compound does not enhance survival of total and fecal coliform bacteria in soils or water.
		Polyacrylamide (PAM) has reduced total (TC) and fecal (FC) coliform bacteria in animal waste water flowing in irrigation furrows.
	www.ars.usda.gov /research/publications/publications.htm?SEQ_NO_115=160030&pf=1 (550 words)

	Worldwide Research Suggestions for Cross-Linked Polyacrylamide in Agricultural Research - 13 September 1992 (Site not responding. Last check: 2007-10-20)
		Cross-linked polyacrylamide (CLP) is a synthetic water-absorbing polymer made from natural gas, capable of absorbing 400 times its weight in deionized (pure) water, or 150-300 times its weight in irrigation water in most soils.
		We consider cross-linked polyacrylamide to be the "Rolls Royce" of the water-absorbing soil polymers because of high general performance, longevity, and the fact that it is gel-forming.
		Cross-linked polyacrylamide worked into bare soil often suffers from a natural drying process (loss of performance) in the top 0-8 cm (3.2 in) of the soil profile, and some type of mulch greatly increases performance due to the significant reduction in soil evaporation loss.
	www.hydrosource.com /clpbbs12.htm (5592 words)

	Partition and Permeation of Dextran in Polyacrylamide Gel -- Williams et al. 75 (1): 493 -- Biophysical Journal
		Partition and Permeation of Dextran in Polyacrylamide Gel
		Polyacrylamide gels were prepared as for electrophoresis using typical methods.
		of polyacrylamide was assumed to be 0.7, 1.0, or 1.3, the relative
	www.biophysj.org /cgi/content/full/75/1/493 (5909 words)

	Denaturing Polyacrylamide Gels
		However, by electrophoresing aliquots of the sequencing reaction for different lengths of time, it is possible to read up to 500 nucleotides of sequence from a single gel.
		The concentration of acrylamide used to prepare the gel depends on the size of the DNA fragments that are to be analyzed (see section pageintro).
		A 0.4 mm thick, 8 M urea, polyacrylamide sequencing gel was used.
	www.uni-graz.at /~binder/thesis/node59.html (835 words)

	Use of Cross-Linked Polyacrylamide in Agriculture for Increasing Yield or Reducing Irrigation - 8 November 1989
		Cross-linked polyacrylamide is shown to carry out its earlier promise of cost-effective reduction of watering requirements for irrigated crops and increase of yields with the same water application.
		Western Polyacrylamide, Inc. is a small, low cost, high volume firm with a strong commitment to promoting research into agricultural, landscaping and other horticultural uses of cross-linked polyacrylamide.
		The ability of cross-linked polyacrylamide to reduce stress in plants is a recurring theme in the comments of many researchers and observers.
	www.hydrosource.com /clpbbs03.htm (6288 words)

	Effects of Supercoiling in Electrophoretic Trapping of Circular DNA in Polyacrylamide Gels -- Åkerman 74 (6): ...
		DNA the degree of electrophoretic orientation in polyacrylamide
		A study of electrophoretic mobility of DNA in agarose and polyacrylamide gels.
		Dynamics of single-stranded DNA in polyacrylamide gels during pulsed field gel electrophoresis.
	www.biophysj.org /cgi/content/full/74/6/3140 (7201 words)

	Principles of Gel Electrophoresis (Site not responding. Last check: 2007-10-20)
		Polyacrylamide gels are significantly more annoying to prepare than agarose gels.
		Polyacrylamide is considered to be non-toxic, but polyacrylamide gels should also be handled with gloves due to the possible presence of free acrylamide.
		In contrast to agarose, polyacrylamide gels are used extensively for separating and characterizing mixtures of proteins.
	arbl.cvmbs.colostate.edu /hbooks/genetics/biotech/gels/principles.html (434 words)

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