An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
... Yarns made from raw cotton, "purified" cotton, mercerized cotton, clothing wool, carpet wool, viscose rayon, cuprammonium rayon, cellulose acetate, and degummed silk were saturated with water and then exposed for periods of 1/2 to 6 hours in air having temperatures of 221° 257 °, and 302° F. and absolute humidities of approximately 1%, 55%, and 95%. After conditioning the dried yarns for at least ...
... For the determination of the degree of polymolecularity in acid-modified celluloses the nitrates of hydrocelluloses from native cotton, surgical cotton, and viscose rayon were frac tionated from dilute acetone solutions. The results indicate that a large proportion of the hydro celluloses are uniform in that almost 33% of the methanolyzed native cotton consists of mole cules with D.P. 252, about 7 ...
... Exposure of cotton fiber to cell-free filtrates obtained from certain culture media after the growth of microorganisms increases the degree of subsequent swelling of the fiber in NaOH solutions. The active agency in the filtrates is here termed " S factor." Its action is measured by a previously described alkali-centrifuge test [12]. With the fungus Myrothecium verrucaria, S factor was produced du ...
... A technique is presented for etching cellulose acetate fibers and films by direct solution of the surface molecules. A relatively undisturbed interior layer of polymer is uncovered for replica tion. Etching is achieved by immersing the polymer for a short period in acetone cooled to — 50°C and then flooding with an excess of cold absolute alcohol. The resulting surfaces may be replicated for elect ...
... The seed hairs of the common milkweed (Asclepias syriaca, L.) have been found to contain 39.6% alpha-cellulose, 35.3% pentosan (chiefly xylan), and 15.1% lignin. The alpha-cellulose fraction was entirely composed of anhydroglucose, the hemicellulose por tion of anhydroxylose units. The original material, in addition, also contained minor amounts of arabinose and uronic acid residues. Direct nitrat ...
... Cotton yarns made from an American upland cotton were pre-extracted with either acetone or monoethanolamine. In the present investigation they were reacted with beta- propiolactone either in the presence of xylene by the reflux method, or in the presence of either 8 or 15% sodium hydroxide by the alkali method to secure add-ons in weight of up to 36.9.% A new type of modified cotton produced by gr ...
... Dieldrin does not react with wool but, during treatment in aqueous emulsions, some of the insecticide penetrates the fibers. This small amount, sufficient to mothproof the wool, is not removed by the usual drycleaning solvents which do not cause swelling, but can be extracted completely by hot methanol or acetone. Dieldrin is gradually lost when treated wool is washed in soap solutions, but an ini ...
... Soils and micaceous minerals were extracted with NaBPh₄-salt solutions to determine the ease with which nonexchangeable K can be removed when the blocking effect of fixable cations is reduced. Essentially all of the K in vermiculite, 12% of the K in muscovite and as much as 47% of the K in illite was extracted by the NaBPh₄-salt solutions even though most of the K in these materials was otherwise ...
acetone; fabrics; flax; jute; nitrates; textile fibers; water solubility
Abstract:
... Three samples of flax and one sample of jute were nitrated with a mixture of HNO₃/H ₃PO₄/P₂O₅ for several lengths of time, ranging from to 72 hr. The crude nitrate, Fraction A, was extracted with acetone and the acetone extract precipitated with water, giving three fractions: A1, the acetone-soluble fraction precipitated by water, A2, the acetone-insoluble fraction, and A3, the acetone- and water- ...
... The effect of temperature upon the toxicity of DDT to a sensitive and a resistant strain of houseflies has been determined over the range 5° to 35° C. Acetone and acetone plus light spray oil were used as solvents for topical application. Maximum toxicity resulted at approximately 10° C. When the synergist 1,1-bis p-chlorophenyl methyl carbinol (DMC) was added in 1: 1 ratio by weight, the resistan ...
... Light microscopy has been used to examine polyglycine and poly(hexamethylene sebacamide) deposited on the fiber by polymerization of the appropriate monomers and also polymethylmethacrylate deposited from solution in acetone. Two types of deposits occur: (i) a thin, discontinuous layer which covers most of the cuticle and is observed by mounting in “Sellotape” and (ii) irregularly placed, large pi ...
... The CEC of a strong acid-exchange resin, four clays, and several soils was determined using various cations for saturation and a wide variety of solvents for removal of the excess electrolyte. Precipitation of the salts in the solvents was avoided by using the more soluble acetates of the monovalent ions and the chlorides of the polyvalent ions, and by diluting the occluded volume of salt solution ...
... A rapid, semiquantitative method (I) and a quantitative method (II) are proposed for the determination of gypsum in soils. Method I involves the determination of the degree of gypsum-unsaturation of an aqueous soil extract nearly saturated with gypsum, i.e., sufficiently dilute to dissolve all gypsum initially present. The unsaturation is determined by electrical conductivity (EC) measurements bef ...
... A simple method is described enabling the estimation of low enzymatic activities of DDT-dehydrochlorinase. Acetone powders of the insect material are incubated with DDT-suspensions obtained by adding small amounts of DDT solutions in dimethylsulfoxide to the buffer solutions. After the reaction the mixture is extracted and the remaining substrate and the product formed are measured by gas-liquid c ...
... The relative swelling of cotton in 67 organic liquids and aqueous solutions of 14 inorganic compounds was evaluated by observing the number of revolutions of a singles yarn of Iquitos variety during untwisting in a 3-min post-immersion interval. Aqueous dilutions of the lower alcohols, two organic acids, acetone, and ethanolamine were also tested. The yarn was used in the unpurified state, after s ...
... Phytotoxic substances were extracted from soil with 0.1m Na₄P₂O₇ and acetone. The ether-soluble substances from the pyrophosphate extract were separated into acidic, neutral, and basic fractions. Acidic materials exhibited the highest phytotoxicity, followed by basic materials and then by the neutral fraction. The acetone extract of soil was fractionated on an alumina column using a solvent elutio ...
... A simplified method for thin section preparation requires a relatively small amount of materials and time. Heating is required only twice, no evacuation is necessary, and only one impregnating solution is used. A ratio of 3.5 parts of acetone to 1 part of Laminac resin is used for impregnation, with Lupersol DDM as a catalyst. Impregnated chips and cover glasses are attached to slides with clamps, ...
... Detailed procedures are presented for denervation of the American cockroach heart, Periplaneta americana L., by removal of the lateral cardiac nerve cords. Results of bioassay with the innervated heart are also presented and compared to responses obtained from identical assay conditions with the denervated heart. The response of the innervated heart to 10⁻³ M sodium azide, slight changes in the co ...
... SKA flies have two factors of resistance to dieldrin: the major factor DR₄, on the IV linkage group, is intermediate and confers immunity to topically applied dieldrin in acetone during the first 24 hr, but increasing numbers of deaths during the next 72 hr decrease resistance to ca. × 700. The proportion of SKA flies with this factor has decreased over the last three years from ca. 25% to fewer t ...
... Eight species of fungi isolated from a water repellent soil were incubated for varying periods of time in silica sand. In their latter stages of growth, two of the fungi, Aspergillus sydowi and Penicillium nigricans, caused limited water repellency in the sand. All the fungal sand cultures exhibited water repellency when heated briefly at temperatures between 200C and 400C. The times required to p ...
... Dry cotton hay or seed samples from plants grown in 0.5 ppm ¹⁴MC-DDT, -dieldrin, -endrin, and -heptachlor treated soils were subjected to exhaustive Soxhlet extraction with chloroform/methanol (CM), hexane/acetone (HA), hexane/acetone/methanol (HAM), or hexane/acetone/ methanol/water (HAMW). Extracts further were fractionated by selective elution from Florisil columns and the ¹⁴C-insecticide resid ...
Monte Carlo method; acetone; adsorption; clay; differential equation; films (materials); soil; soil-atmosphere interactions
Abstract:
... A special Monte Carlo method for use in investigating problems which involve random processes is developed. This approach differs from the usual Monte Carlo method for solution of differential equations in that the random process itself is constructed directly. The power of this approach is demonstrated by application of the method using two examples. In one case, the effect of thermal gradient on ...
... A method has been developed for the rapid analysis of water adsorbed on cotton or modified cottons. The sample is extracted with anhydrous acetone and the solution is chromatographed on a Porapak T column. Quantitation is based on an internal methanol standard. Formaldehyde, which can also be extracted in acetone, can be measured. An ap plication of the method to the analysis of some flame-retarda ...
... In order to provide a rational basis upon which future developments in nonaqueous finishing and other processing of textile materials may be based, a basic study is being undertaken of the interactions between textile fibers and a wide spectrum of organic solvents. In this paper are reported the effects on mechanical properties of a polyester yam of 26 organic solvents differing widely in chemical ...
... Sorption measurements of acetone vapor (activity = 0.9 at 50°C) on oriented PET fibers indicated that sorption capacity does not decrease linearly with increasing crystallinity. It was found that the acetone uptake based on amor phous volume, when plotted vs crystallinity, passed through a minimum at 0.48 volume fraction crystallinity. ...
... PCNB (pentachloronitrobcnzene) and DCNA (2,6-dichloro-4-nitroaniline) are widely used as soil fungicides and have been found to be quite persistent in soils at field moisture capacity. Laboratory experiments were conducted to determine the effects of flooding, sterilization, addition of organic matter, atmosphere composition, free or combined oxygen, and soil temperature on pesticide decomposition ...
... THP and THPC can be titrated quantitatively by 0.1 N iodine in weakly basic media such as pyridine, aqueous NaHCO₃ or aqueous Na₂HPO₄. Aldehydes do not interfere. Titration in hydrochloric acid solution, as recommended in the literature, is possible only if the THP is aldehyde-free. The stoichiometry of the disproportionation of THP in 6 N HCl to phosphine and THPC has been established by iodine t ...
... The reaction of wool with cyanuric chloride from an acetone-water mixture results in crosslinking only if the wool has previously been reduced. Introduction of cyanuric chloride from acetone solution and subsequent aqueous aftertreat ment causes complete reaction of all three chlorine sites in cyanuric chloride, while under comparable conditions in solution only one site is reactive. Esterificatio ...
... The aqueous stability of a mono-azo disperse dye (Resolin Red BBL) is measured as a function of concentration of sodium dodecylsulfate (NaDDS) at 95°C. The rates of dye solubilization, aggregation, and degradation are measured and related to the concentration of NaDDS and to the critical micelle concentration (CMC). Dye stability decreases sharply for concentrations of NaDDS greater than the CMC p ...
... Residues from crownvetch (Coronilla varia L.) leaflets were obtained from evaporation of acetone, methanol, and aqueous extracts and added to standard forages to evaluate a previously observed negative relationship between crownvetch in vitro dry matter disappearance (IVDMD) and anti-quality substances. The activity of the residue was characterized by changes in the IVDMD of the standard forages. ...
... Acetone and methylene chloride have been advocated as carrier solvents for incorporation of growth regulators and seed protectants into seeds. The penetration and effects of these solvents on cottonseed (Gossypium hirsutum L.) were studied. Seeds immersed in the solvents had normal germinability, whereas excised embryos and gin-damaged seeds were killed by immersion in the solvents, apparently due ...
... Study of the effect of treatment of cellulose with a flame retardant required knowledge of the behavior of cellulose alone under the conditions of the experiment. Compounds obtained included carbon monoxide, carbon dioxide, water, methane, ethane, ethene, propane, propene, butene, acetaldehyde, furan, 2-methylfuran, methyl ethyl ketone, 2,5-dimethylfuran, 2,3-butanedione, methyl isopropenyl ketone ...
... Pyrolysis-gas chromatography-mass spectrometry studies of fulvic and humic acids from different soils: Calcic Rhodoxeralf, Typic Xerochrept, Typic Chromoxeret, Andic Hapludult, Humic Haplorthod, Typic Haplorthod and a Canadian Orthic Humo-Ferric Podzol were made. Samples were pyrolyzed at 700°C for 10 sec, and low boiling point compounds were separated in a Chromosorb 102 column. Peaks were identi ...
... Freshly harvested Kentucky bluegrass (Poa pratensis L.) seed generally fail to germinate rapidly. Such seed germinate poorly under warm temperatures. The ob.]ectire of this study was to permeate seeds with vartous plant-growth regulators and determine their effects on speed and total germination under favorable and unfavorable conditions. Freshly harvested ‘Merion’ and ‘H.I’ Kentucky bluegrass see ...
acetone; ammonia; ammonium acetate; calcium; calcium chloride; casein; pH; tap water; temperature
Abstract:
... Differential solubilities of casein fractions in solutions of calcium chloride have been used as the basis for separating calcium‐soluble k‐casein from calcium‐insoluble casein fractions. The amount of protein precipitated increased linearly with increasing calcium concentration up to 0.5M. The temperature of reacting casein with calcium and the extraction temperature for separating the soluble pa ...
... An enzyme of value for cheese whey utilization was purified from a microorganism that is a good source and is itself approved for use in foods. β-Galactosidase was purified to apparent homogeneity from cell-free extracts of K. fragilis by acetone precipitation, pseudoaffinity chromatography, hydroxylapatite chromatography and DEAE-Sephadex A-50 chromatography. The mol. wt. was 201 000 and the part ...
... Reaction of cellulose carbamate with p-nitroaniline seems to occur via direct condensation of the amino group of p- nitroaniline with the carbamate groups of cellulose carbamzte. This reaction was effected by using three techniques: viz. a) padding cellulose carbamate in p-nitroaniline dissolved in acetone, drying, and baking at 180°C; b) padding cotton cellulose in aqueous urea solution, drying, ...
... Pot experiments were conducted to study the plant uptake of Pu from major Indian soil types and its distribution in plants. It was observed that, irrespective of plant species, highest amount of Pu was absorbed from acidic laterite soil baying predominantly kaolinite clay mineral and low cation exchange capacity followed by alluvial soil and was lowest in medium black alkaline soil with predominan ...
... Oscinella frit have been reared in large numbers over a 2-year period using oat plants as host. The attraction between frit fly and oat shoots can be said to be partly visual and partly chemical. Extraction of oat plants with four solvent systems, e.g. 80% ethanol, acetone, chloroform: methanol and chloroform enabled an active fraction to be obtained which attracts frit fly. A synergistic interact ...
... Corn infected by Aspergillus flavus and A. parasiticus is frequently contaminated with aflatoxin. If the contamination exceeds 20 ppb, the corn is considered unfit for animal consumption and is often plowed into the soil. This study was undertaken to determine the fate of aflatoxin in the soil. Aflatoxin B₁ was added to soil at a rate of 10,000 ppb. The soil was periodically extracted with acetone ...
... A study on the condensation of L‐sorbose with acetone to form 2,3‐4,6‐di‐o‐isopropylidene sorbose (diacetone sorbose, DAS) in the presence of various macroporous cationic exchange resins (sulfonic acid type based on styrene and divinyl benzene copolymers) has been carried out. The condensation rates were found to be dependent on the characteristics of the resins such as surface area and percent cr ...
... Efficiency of indirect immunofluorescence microscopy (IFM) for detection of M. pulmonis antibody (IgG) in rats was compared with results of enzyme-linked immunosorbent assay (ELISA), complement fixation (CF), cultural isolation and histopathology. IFM was carried out on M. pulmonis infected BHK-21 cells grown on cover slips or multitest slides. After acetone fixation these antigen carriers could b ...
... The antibiotic activity of some compounds, and of plant extracts, was bioassayed by incorporating them in a wheat germ diet developed for rearing cotton spotted bollworm (Earias vittella F.). Acetone extract of square powder caused maximum mortality followed by gossypol, tannic acid, other tannins and anthocyanins. Hexane extract of bolls did not affect larval survival. Rutin, anthocyanins and eth ...
... An attempt was made to dye an aqueous alkali swollen cotton with CI Reactive Red-31 from polar/nonpolar solvent mixtures. For this purpose acetone was selected as the nonpolar solvent and the various polar solvents were water, formamide, di methylsulfoxide, dimethylformamide, and dimethylacetamide. At a suitable ratio of solvent mixture and alkali concentration used for cotton preswelling, it was ...
... The residual biodegradation produces of wheat straw lignin attacked by Cyathus stercoreus for thirty days were identified. Low-molecular-weight nonvolatile materials constituted less than 5% of the total 14C released from labeled lignin. In this portion, syringic acid, vanillic acid, p-hydroxy benzoic acid, acetic acid, and 2-methoxy-succinic acid were found. The majority of the water-soluble biod ...
... Growing concern for groundwater pollution with potentially hazardous organic chemicals from waste disposal sites prompted this investigation of determining organic pollutants in leachates from a number of municipal landfill sites. Identification of the various compounds was attained using multicolumn GC and GC/MS (gas chromatography/mass spectrometry) techniques. Volatile compounds were concentrat ...
... A 2-year study was conducted in order to study the chemical form of Mg in different grass and legume species that are commonly used for livestock feeding in the Northeastern United States. Orchardgrass (Dactylis glomerata L.), tall fescue (Festuca arundinacea Schreb.), and alfalfa (Medicago sativa L.) were treated with magnesium sulfate (MgSO₄. 7H₂O) and dolomitic limestone (CaCO₃.MgCO₃) at 280 kg ...
... Bracts of cotton plants (Gossypium hirsutum) of three varieties grown in three states were extracted with 70% acetone. The condensed tannins in the extracts and in extracted and unextracted bracts were hydrolyzed in butanolic HCl, and the types and levels of anthocyanidins produced were compared by TLC and spectroscopy. The area of growth had more of an effect than did the variety on levels of ant ...
... Root formation on etiolated hypocotyl cuttings of Vigna radiata L. is greatly enhanced in the presence of ethanol, methanol and acetone. Low concentrations of solvents plus sucrose slightly promoted the formation of roots. ...
... The effects of three drying techniques on total porosity and pore size distribution of soil materials were studied by Hg intrusion porosimetry. The three soils investigated had different clay contents (21%, 35%, and 44%), but the clay fraction of each was dominated by montmorillonite. Some samples were dried in an oven at 40°C for 7 d; some samples were quick-frozen in liquid N and lyophilized; so ...
... Batches of wild-caught adult females of Glossina palpalis palpalis R.-D. were treated topically (0.36 μl per fly) with different doses of 14 chemical insecticides in acetone and subsequent abortion (if any) and death of each fly were recorded. Control flies received acetone alone. No fly was fed after treatment. Abortion rates of treated fly-batches and the corresponding control batch were compare ...
... The ability of concentrated organic chemicals, with low dielectric constants (E) to increase the hydraulic conductivity of compacted soils has been well documented. This study was undertaken to evaluate a mechanism by which these increases occur. Theory predicts that the spacing between adjacent clay particles diminishes as the E value decreases. Hydraulic conductivity measurements were made in fi ...
... The surface horizon of the Bainsville soil, an Aquoll, was extracted by supercritical gas (SCG) extraction with solvents of increasing polarities. These included n-pentane, ethanol, and mixtures of ethanol and acetone with water. Each extract was analyzed by chemical and ¹³C nuclear magnetic resonance (NMR) methods. Proportions of alkanes, alkanoic acids, and carbohydrates in the extracts decrease ...
Ramalina; acetone; air pollution; chlorophyll; lichens
Abstract:
... The most efficient of five methods used for the extraction of ATP from lichens was found to be the use of Tris + EDTA after acetone treatment. Changes in the concentration of ATP in transplanted Ramalina duriaei (De Not.) Bagl. reflected the influence of air pollution on this lichen. The ATP concentration remained constant at a control station in a rural site, whilst at urban stations it decreased ...
... A method is described for determining 1,2-dibromoethane (EDB) in soils previously fumigated with EDB. The procedure involves extraction of soil with methanol at 75°C for 24 h in a sealed vial, followed by gas chromatographic analysis of the extract. Reproducibility of the method was demonstrated using replicated samples by separate analysts, and the detection limit was ≤1.8 µg kg⁻¹. Acetone and ac ...
... Delintered cottonseed was hulled and flaked. Moisture-adjusted cooked and uncooked samples were either dried or left undried, and all samples were then Soxhlet-extracted with acetone for five hours and desolventized. Sensory testing of gruels prepared from the meals indicated that if free moisture was not present during acetone extraction, catty odors were not found in extracted meals. Gas chromat ...
A horizons; C horizons; Mollisols; Ultisols; acetone; adsorption; methanol; octanol; organic carbon; pyridines; solvents; sorbents; water solubility
Abstract:
... Sorption of 9H-carbazole was investigated from aqueous and co-solvent solutions on soils with different physical and chemical properties. Sorption was nonlinear, but well correlated to the organic carbon (OC) content of the soils. The variability of the Freundlich adsorption constant (Kₜ), normalized to OC (Kᶠₒc) is small between A horizons of two Mollisols and two Ultisols but increases to about ...
... Naturally-contaminated yellow dent corn containing 1600 μg total aflatoxin per kg was treated with 3% NaOH at 100°C for 4 min. After washing, the moisture was adjusted by autoclaving at 121°C and the product was deep fired at 196°C for 15 min to produce a corn snack. Samples were taken after each processing step. Aflatoxin levels and mutagenicity of acetone extractions of alkaline and acidified pr ...
... An indirect immunoperoxidase procedure using a specific anti- Ehrlichia risticii monoclonal antibody and an avidin-biotin-peroxidase staining method was used to detect E. risticii antigen in infected P388D1 murine monocytes. Several different methods of cytological fixation were used, including acetone (15 min), 95% ethanol (15 min), Bouin's fixative (5 hr), and 10% buffered neutral formalin (24 h ...
... An experiment was carried out to determine the uptake rate and fate of SO² absorbed by the forest canopy. The radioactive tracer, ³⁵S was used. Branches of loblolly pine were exposed to ³⁵SO₂ in the field with a portable chamber. The exposed branches were excised and a sample of needles was immediately washed with distilled water. The needles and water collected in the field were analyzed for ³⁵S ...
... Laboratory groups of the Formosan subterranean termite, Coptotermes formosanus Shiraki (Isoptera: Rhinotermitidae), were fed for 14 days on wood shavings soaked in acetone solutions of 0%, 0.5% or 1% concentrations of the dye, Sudan Red 7B or on shavings not soaked in acetone (0% non-acetone, NA). Termites feeding on dyed wood became visibly stained red. Groups of dyed or non-dyed termites were th ...
... Humic substances were extracted from an organic soil of Tuscany, Italy, with solutions operating by three different mechanisms: charge repulsion (NaOH under N₂), ligand exchange (Na₄P₂O₇ at pH = 7), and H-bond disruption (dipolar aprotic solvents in mixture with dilute HCl). Solution-state ¹³C-nuclear magnetic resonance (NMR) spectra were obtained for the unpurified and purified (HCl-HF treatment) ...
... Experiments and observations on the oviposition behavior of Chaetorellia australis Hering (Diptera, Tephritidae) females, caged in the laboratory with their natural oviposition substrates, floral buds of the yellow starthistle (YST) Centaurea solstitialis L. and Centaurea cyanus L. (Asteraceae: Cardueae) revealed that females of that species deposit a contact host-marking pheromone immediately aft ...
... Acetone and ether: acetone extracts of the mushrooms Lactarius fuliginosus (Fr. ex Fr.) Fr., L. fumosus fumosus Peck and L. fumosus. fumosoides (Smith and Hesler) Smith and Hesler were toxic to the corn earworm, Heliothis zea (L.), while water extracts were inactive. Ether: acetone extracts of L. fuliginosus and L. fumosus fumosus were toxic to the large milkweed bug, Oncopeltus fasciatus (L.), an ...
... Application of the thiobarbiturate acid (TBA) reaction to pigmented plant tissues (sugarbeet green leaves and calli) leads to an overestimation of malondialdehyde (MDA) concentration. A method of MDA estimation for pigmented plant tissues has been developed, using the trichloroacetic acid precipitated protein pellet, with acetone depigmentation, before TBA reaction. Absorbance is measured between ...
... The juvenile hormone mimic, pyriproxyfen (2-[1-methyl-2-(4-phenoxyphenoxy)ethoxy]-pyridine) was 28 times more effective than S-methoprene at inducing a supernumerary moult following topical application in 1 μl acetone to 5th instar larvae of Rhodnius prolixus Stål. ED₅₀ values of 0.15 μg and 4.20 μg per insect were obtained. Adult females produced by 5th instars dosed with 0.2 μg pyriproxyfen prod ...
... Stalk and leaf samples of celery treated with radiolabeled avermectin B1a were serially extracted with acetone, MeOH/H2O (40/60), and hot DMSO. Characterization of the residues extractable with acetone has previously been reported. Characterization of the residues extractable by aqueous MeOH and hot DMSO, which solubilizes lignin, demonstrated that the residues were mostly unknown polar degradates ...
... Ground beef (GB) samples were maintained in atmospheres of 2 or 18% oxygen. Similar putrid spoilage occurred at both concentrations, although the microflora differed. Two of 10 isolates from fresh and spoiled GB, nonfluorescent pseudomonads, produced putrid aromas but only 4 volatile compounds in common when inoculated into sterile GB. A Moraxella isolate produced a pronounced estery, decayed vege ...
... Five new diterpenoid glucosides, named mascaroside I (1), mascaroside II (2), paniculoside VI (3), cofaryloside I (4), and villanovane I (5), along with seven known ent-kaurane diterpenoid glucosides (6â12) were isolated from acetone extracts of the roasted coffee beans of Coffea arabica var. yunnanensis. Their structures were established by extensive spectroscopic analysis including 1D and 2D N ...
... A field study in Zimbabwe of Glossina pallidipes Austen and G. morsitans morsitans Westwood supported Waage's (1981) hypothesis that the striped pattern of zebras may protect them from being bitten by blood‐sucking flies. In addition, the results suggest that the orientation of the stripes may be crucially important for the unattractiveness of zebras. The relative attractiveness of five different ...
... The adsorption of atrazine (2-chloro-4-ethylamino-6-isopropylamino-1,3,5-triazine) or metolachlor (2-chloro-6′-ethyl-N-(2-methoxy-1-methylethyl)acet-o-toluidine) to a variety of plastics and silicone rubber was determined. Both herbicides adsorbed rapidly to silicone rubber, Nalgene 180, Tygon R-3603, and somewhat less rapidly to low-density polyethylene. Neither of the herbicides was significantl ...
... Merino wool top was treated with low-temperature plasmas of helium/ argon and acetone/argon under atmospheric pressure for 30 seconds and then dyed with two leveling-type acid dyes, CI acid orange 7 and CI acid red 18, and two milling-type acid dyes, CI acid blue 113 and CI acid blue 83. Dyeing rate and saturation dye exhaustion increased with the atmospheric low-temperature plasma treatments as w ...
... Using ¹⁴C cholesterol as a marker a positive correlation was established between the amount of oil (a chlorinated n-alkane containing 43-46% chlorine, ‘cereclor S45') picked up by an adult tsetse fly exposed by tarsal contact to a treated surface and the duration of such exposure. Only a poor uptake was achieved from netting surfaces treated with less than 50% oil in acetone. Terylene netting trea ...
... Polypropylene fabrics were extracted with carbontetrachloride and acetone by Soxhlet extraction, and then PPAN (plasma polymerized acrylonitrile) was grafted to the surface of the extracted fabrics using a ground pressure of 0.05 mm Hg, 0.3 mm Hg pressure in the reactor, 60 W and 100 W RF power, and reaction times of 30 seconds, 1, 3, and 5 minutes. ESCA analysis was used to determine the ratios o ...
... Tannins are generally extracted using aqueous organic solvents, mainly methanol and acetone. The presence of various concentrations of methanol in the sample containing catechin or tannins did not alter the kinetics of their reaction, but the absorbance depended on the amount of methanol in the sample; the higher the methanol, the higher was the absorbance. Acetone reacted with acidified vanillin ...
... The physicochemical conditions favoring the action of chlorophyllase in olive fruit itself have been investigated. Different temperatures and aqueous incubation media that contained acetone were tested. The highest levels of chlorophyllase activation in whole fruits (without extraction of the enzyme) were achieved by heating the fruits at 50 degrees C in a buffer (pH 8.5)-acetone (1:1) mixture. A ...
... Females of the almond seed wasp, Eurytoma amygdali Enderlein (Hymenoptera, Eurytomidae), responded in an olfactometer positively to odours from almond flowers and unripe fruits, but not to almond leaf odours and odours from flowers and unripe fruits of certain other nonhost Prunus species. Males responded to none of these odours. Extracts of undamaged unripe almond fruits (using ethanol, methanol, ...
... The effect of overheating on the nutritive value of cottonseed meal (CSM) for chicks and protein solubility in .2% KOH was evaluated. One-week-old male chicks were assigned to seven diets consisting primarily of corn and unautoclaved commercial CSM (expander-solvent extracted) or CSM that had been autoclaved for 20, 40, 60, 90, or 120 min at 121 C and 105 kPa. The protein level of the diets was ei ...
... The ‘crude’ filtrate (CF) of Phytophthora cactorum containing phytotoxin(s), having some properties similar to the toxins isolated from other Phytophthora species, was processed by three steps (acetone precipitation, dialysis and gel filtration chromatography). The CF fractions corresponding to the progressive steps of purification were tested for phytotoxicity on tomato seedlings and for activity ...
... Citric acid (CA) has successfully been separated from other organic acids, especially oxalic acid which is a byproduct of CA fermentation, by gas antisolvent crystallization with CO2. In this process, crystal grains of CA could be obtained at high speed from an acetone solution by simple pressure regulation. The conditions for the deposition of organic acids are strongly dependent on the saturatio ...
acetone; chemical composition; volatile compounds; essential oils; Nicotiana rustica; alpha-pinene; flowers; chemical constituents of plants
Abstract:
... The volatile constituents obtained by vacuum-steam distillation of the flowers of Nicotiana rustica and of N. forgetiana were profiled by capillary GC and characterized by GC/MS. Compounds comprising 74% of N. rustica flower oil and 72% of N. forgetiana flower oil were identified. Seventeen compounds were observed in N. rustica oil, with the alkaloid, nicotine (25.92%), and the sesquiterpene, arom ...
... Oviposition response of the polyphagous European corn borer, Ostrinia nubilalis (Hübner) (Lepidoptera: Pyralidae), to chemical constituents in host plants was investigated in the laboratory using two‐choice bioassays. Foliar extracts of corn (Zea mays L.), pepper (Capsicum annuum L.) and potato (Solanum tuberosum L.) were prepared using the solvents pentane, acetone and methanol. In all three host ...
... Greenhouse studies using pots and microcosms were conducted to investigate the persistence and fate of nonlabeled and ¹⁴C-labeled anthracene (ANT) and benzo(a)pyrene (B(a)P) in sludge treated soil. Results indicated that ANT degraded rapidly (t₁/₂ ≈ 3 wk) from the experimental systems, but that B(a)P was persistent. Cropping did not affect the persistence of either compound. On completion of the e ...
... Recycling aquatic microecosystems consisting of three subsystems with a total volume of 7.5 L were used to study the effects of the insecticide chlorpyrifos. The poorly soluble chlorpyrifos was dosed dissolved in 0.5 ml of acetone. Acetone was found to be responsible for some of the observed effects. It caused a decrease of the pH by approximately two units. The decrease started 2 weeks after the ...
... A study of the feasibility of utilizing palm oil waste as a substrate for acetone-butanol-ethanol fermentation by Clostridium saccharoperbutylacetonicum N1-4 and, hence, to reduce the biochemical oxygen demand (BOD) of waste disposal was carried out. Among the two types of palm oil waste tested, separator sludge was the better substrate and it was able to support production of solvents by C. sacch ...
... Colletotrichum gloeosporioides secretes a phytotoxic compound that causes anthracnose in Hevea brasiliensis: as a first step we attempted to follow mycelium growth, pH and toxin production by this fungus. The compound was isolated and partially purified by ultrafiltration, acetone precipitation and affinity and gel-permeation chromatography. Material purified was largely carbohydrate with a small ...
Solanum tuberosum; mitochondria; succinic acid; oxidation; oxidoreductases; enzyme activity; measurement; enzyme inhibitors; benzyladenine; acetone; electron paramagnetic resonance spectroscopy; chemical constituents of plants; binding sites
Abstract:
... 6-Benzoylaminopurine (BOAP) inhibits succinate oxidation at the level of complex II (succinate-ubiquinone reductase) in the respiratory chain of plant mitochondria. In order to identify its site of action, the effects of BOAP on mitochondrial membranes of potato tubers were studied using electron paramagnetic resonance (EPR), and compared to those of thenoyltrifluoroacetone (TTFA), an inhibitor of ...
... Marked Glossina pallidipes Austen were released downwind of an odour source in the field in Zimbabwe and the percentage recaptured at the source on the same day was measured. In the absence of odour, 1.3% of the marked tsetse released from a box or refuge were recaptured, independent of the distance between release point and odour source. The distance was varied from 10 to 100 m. When natural ox o ...