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Topic: Hexadecane

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	hexadecane
		you can delete all of the existing hexadecane related messages that are here and write your own.
		Some are hexadecane blogs; others resemble newsletters or columns.
		Although most early hexadecane weblogs were manually updated, tools to automate the maintenance of such sites made them accessible to a much larger population, and the use of some sort of browser-based software is now a typical aspect of hexadecane "blogging".
	hexadecane.wordblogs.net (854 words)

	Tatiana SCHMAKTO: Mécanismes moléculaires de la friction aux interfaces solide-liquides simples (Site not responding. Last check: 2007-10-25)
		The experimental technique we have used to determine the slip velocity relies on measuring the mean velocity of the fluid close to the solid wall using Near Field Laser Velocimetry (NFLV) [1].
		Our results show that squalane as well as hexadecane slips on different smooth solid surfaces.
		Hexadecane has indeed on average a cigar shape whereas squalane is more spherical.
	www.college-de-france.fr /chaires/chaire2/tatiana/schmatko.htm (640 words)

	Modeling the Kinetics of Contaminant Biodegradation By a Mixed Microbial Consortium Based on Carbon Mass Balance - ...
		Hexadecane depletion and hexadecane-degrader population were monitored using sacrificed microcosms by centrifuging the extract so that the supernatant and the residue contained residual hexadecane and microbial population, respectively.
		Hexadecane mineralization and population evolution of hexadecane degraders were determined from the ^sup 14^C-labeled hexadecane partitioning under the assumption that the radioactive and non- radioactive hexadecane have the same fate.
		Radioactivity in the supernatant of the abiotic flasks remained constant at approximately 100% during the experiment, indicating that hexadecane was not degraded abiotically.
	www.redorbit.com /news/display?id=131912 (3658 words)

	[No title]
		The alkanedegrader MPN method uses hexadecane as the selective growth substrate and positive wells are detected by reduction of iodonitrotetrazolium violet, which is added after incubation for 2 weeks at 20°C. Polycyclic aromatic hydrocarbon degraders are grown on a mixture of phenanthrene, anthracene, fluorene, and dibenzothiophene in a second plate.
		Hexadecane and F2 (5 pL/well) were added to the alkane and totalhydrocarbondegrader plates after the wells were filled with growth medium, but before they were inoculated.
		Although the yield on hexadecane was similar to that observed for growth on F2 and crude oil, hexadecanegrown cultures deposited nearly three times as much INTformazan as the cultures grown on the complex hydrocarbons.
	www.bioremediationgroup.org /BioReferences/Tier1Papers/Selective.doc (5512 words)

	Hexadecane mineralization in oxygen-controlled sediment-seawater cultivations with autochthonous microorganisms.
		Hexadecane mineralization in oxygen-controlled sediment-seawater cultivations with autochthonous microorganisms.
		The amount of hexadecane degraded was constant, with an average value of 86% of the initially applied amount.
		The fact that the hexadecane biodegradation rate was constant down to at least 0.04% DOT shows that the actual oxygen concentration is of minor importance as long as the oxygen supply is high enough to guarantee the oxygen-dependent degradation step.
	www.ihop-net.org /UniPub/iHOP/gp/7369594.html (268 words)

	Super spreading of oil by condensed water drops (DOI: 10.1039/b512045b) (Site not responding. Last check: 2007-10-25)
		In spite of the fact that the spreading coefficient of hexadecane is slightly negative on water, the oil actually spreads faster on the droplet covered polystyrene than on the pure substrate.
		The phenomenon may be partially understood by considering the fact that the increase of the free energy of adhesion between the oil and the droplet-covered substrate is greater than the decrease of the cohesive energy of oil during the creation of new oil–vapor surface area.
		The spreading kinetics of hexadecane on the condensed water drops, on the other hand, exhibited a power law of 0.2 for first 2 min followed by the decrease of the exponent to 0.14.
	chemistry.rsc.org /delivery/_ArticleLinking/DisplayHTMLArticleforfree.cfm?JournalCode=SM&Year=2005&ManuscriptID=b512045b&Iss=6 (3492 words)

	Selective enumeration of aromatic and aliphatic hydrocarbon degrading bacteria by a most probable number procedure
		The alkane degrader MPN method uses hexadecane as the selective growth substrate and positive wells are detected by reduction of iodonitrotetrazolium violet, which is added after incubation for 2 weeks at 20°C. Polycyclic aromatic hydrocarbon degraders are grown on a mixture of phenanthrene, anthracene, fluorene, and dibenzothiophene in a second plate.
		Hexadecane and F2 (5 pL/well) were added to the alkane and total hydrocarbon degrader plates after the wells were filled with growth medium, but before they were inoculated.
		Although the yield on hexadecane was similar to that observed for growth on F2 and crude oil, hexadecane grown cultures deposited nearly three times as much INT formazan as the cultures grown on the complex hydrocarbons.
	www.bioremediationgroup.org /BioReferences/Tier1Papers/selective.htm (5227 words)

	Super spreading of oil by condensed water drops (DOI: 10.1039/b512045b)
		The phenomenon may be partially understood by considering the fact that the increase of the free energy of adhesion between the oil and the droplet-covered substrate is greater than the decrease of the cohesive energy of oil during the creation of new oil–vapor surface area.
		The spreading kinetics of hexadecane on the condensed water drops, on the other hand, exhibited a power law of 0.2 for first 2 min followed by the decrease of the exponent to 0.14.
		However, as the hexadecane continues to spread on the rough surface, it thins and consequently the oil–vapor interface roughens considerably.
	www.rsc.org /delivery/_ArticleLinking/DisplayHTMLArticleforfree.cfm?JournalCode=SM&Year=2005&ManuscriptID=b512045b&Iss=6 (3492 words)

	DIALOG Dissertation Abstracts (Site not responding. Last check: 2007-10-25)
		The seasonal pattern in nitrification, denitrification and hexadecane mineralization, and in the occurrence of nirK in the South Saskatchewan River biofilms was: fall greater than winter, which was equivalent to spring.
		Hexadecane mineralization was higher in fall 1999 than in fall 2001, denitrification was similar in these two years, and no seasonal pattern of nitrification was observed.
		At the concentration assessed (1 ppb), hexadecane partially inhibited denitrification to similar extents in both years, had a negative impact on nitrification and hexadecane mineralization in fall 1999, and a positive impact on these two latter activities in fall 2001.
	aslo.org /phd/dialog/200505-10.html (364 words)

	BioMed Central \| Full text \| Alkane-induced expression, substrate binding profile, and immunolocalization of a ...
		Hexadecane treatments resulted in a two-fold increase in mRNA, and a four-fold increase in P450 protein levels relative to control cultures.
		The doubling of steady-state cyp110 mRNA levels in response to hexadecane treatment was independent of nitrogen status of the culture, consistent with previous data showing the entire nifD element is not required for nitrogen fixation in heterocysts [9].
		The hexadecane effect on cyp110 gene expression was further examined using CYP110-specific antibodies to probe for the presence of P450 protein in nitrogen-fixing Anabaena 7120 cultures.
	www.biomedcentral.com /1471-2180/5/16 (5219 words)

	Microbial hydrocarbon 'cracking'
		Hexadecane, a hydrocarbon consisting of 16 carbon atoms and 34 hydrogen atoms, was converted (with participation of water in the reaction) to methane and carbon dioxide.
		Conversion of hexadecane to methane was verified by analytical measurements including the use of non-radioactive isotopes.
		For demonstration of substantial hexadecane consumption, the culture had to be grown for more than one year.
	www.eurekalert.org /pub_releases/1999-09/M-Mh-150999.php (597 words)

	Direct experimental evidences for flow with slip at hexadecane - solid interfaces
		The limit condition for the flow rate at the wall for a Newtonian fluid with various solid/liquid interfaces was studied experimentally using an original high resolution technique.
		A notable interfacial slipping was shown for the hexadecane flowing on a surface with low roughness and covered with methyl groups (non wetting surface for the hexadecane).
		The systematic study of various modified surfaces made it possible to identify two key parameters fixing the amplitude of slipping at the wall and acting in an antagonistic way on the roughness of the surface (geometric and chemical) and the fluid/surface interactions.
	www.edpsciences.org /articles/metal/abs/2001/02/pit/pit.html (140 words)

	CSM: Annual Conference - View 2004 Conference Abstract
		Impact of nutrients, hexadecane and temporal variations on the activity and composition of river biofilms.
		This study focused on the impact of nutrients, hexadecane (a petroleum hydrocarbon pollutant) and temporal variations on replicated river biofilms.
		Hexadecane had a negative impact on the assessed activities.
	www.csm-scm.org /english/abstracts/public/view_abs.asp?id=1190 (415 words)

	[No title] (Site not responding. Last check: 2007-10-25)
		The objective of this laboratory study was to determine the influence of temperature, moisture, and N addition on the degradation rate of an aliphatic hydrocarbon, hexadecane, in a Captina silt loam.
		The soil was amended with 600 µg hexadecane/g soil and incubated at 18 or 28°C, moisture potentials of -33 or -200 kPa, and N addition rates of 0 or 50 µg/g supplied as potassium nitrate.
		Under optimal moisture conditions of -33 kPa and an N addition rate of 50 µg/g, the hexadecane degradation rate was greater at 28°C than 18°C with k values of 0.48 and 0.34/day, respectively.
	ipec.utulsa.edu /Conf2004/Abstracts/greer.html (180 words)

	Permeability Assay - Millipore - Multiscreen Plates
		After the artificial membrane has been applied to the polycarbonate membrane in the filter plate (known as the Donor plate), the 96-well Donor plate is filled with buffer solutions containing the compounds to be tested.
		To ensure that hexadecane layers were intact, electrical resistance measurements were made both before and after permeability assays were conducted.
		The melting temperature of hexadecane is 18 °C and even small temperature changes have the potential to affect the viscosity/permeability of the artificial membrane layer.
	www.millipore.com /publications.nsf/docs/an1725en00 (2124 words)

	Microcrystalline wax
		Dissolve the 1 ml of hexadecane residue in isooctane and make to 25 ml volume.
		To the residue, add a 10 ml portion of isooctane and re-evaporate to 1 ml of hexadecane.
		Add 10 ml of methyl alcohol and approximately 0.3 g of sodium borohydride (Minimize exposure of the borohydride to the atmosphere.
	www.fao.org /docrep/W6355E/w6355e0m.htm (3905 words)

	Energy Citations Database (ECD) - - Document #20006622
		The influence of a nonionic (alcohol ethoxylate) surfactant (Witconol SN70) on biodegradation of phenanthrene and hexadecane (nonaqueous-phase liquid) in soil was studied in batch and transport systems.
		Simultaneous enhancement of phenanthrene and hexadecane degradation was noted at surfactant doses resulting in aqueous-phase surfactant concentrations below the critical micelle concentration (CMC).
		Mechanisms of inhibition of phenanthrene and hexadecane degradation at supra-CMC surfactant concentrations may include changes in interfacial chemistry and subsequent mass transfer processes due to sorbed surfactant, reduced bioavailability of micelle-bound phenanthrene and hexadecane, or inhibition of specific members of the microbial community responsible for hydrophobic organic compound degradation.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=20006622&query_id=0 (301 words)

	Assessing the Role of Pseudomonas aeruginosa Surface-Active Gene Expression in Hexadecane Biodegradation in Sand -- ...
		Hexadecane is the sole C source; N is provided as either NO (top) or NH (bottom).
		hexadecane is lower in liquid culture than in sand culture.
		Effects of a nonionic surfactant on biodegradation of phenanthrene and hexadecane in soil.
	aem.asm.org /cgi/content/full/68/5/2509 (5326 words)

	Coating compositions containing a highly fluorinated polymeric additive - Patent 5948851
		The coating composition of claim 1 in which the flouro alkyl containing monomer is represented by the formula ##STR12## where R is as defined in claim 1, n is an integer of 1-11 and R.sub.f is a straight chain or branched chain fluoro alkyl group having 4-20 carbon atoms.
		The amount of dirt remaining on the panel was measured in delta E units with a color analyzer.
		The Soil Resistance Test shows that coating compositions A-C that contained the fluorinated acrylic polymer additive provides a finish which is resistant to soiling and also is easily washed or wiped clean in comparison to the clear coating composition made from the control which did not contain a fluorinated acrylic polymer additive.
	www.freepatentsonline.com /5948851.html?highlight=4366299 (3708 words)

	Water Science & Technology 46:1-2 (2002) 519-524 - K.R. Pagilla et al. - Gordonia (nocardia) amarae foaming due to ...
		The lowest surface tension was less than 40 dynes/cm when either 1% (v/v) hexadecane or a mixture of 1% (v/v) hexadecane and 0.5% (w/v) acetate was used as the carbon source.
		The maximum biomass concentration (the stationary phase) was achieved after 4 days when acetate was used along with hexadecane, whereas it took about 8 days to achieve the stationary phase with hexadecane alone.
		CMC with the mixture of hexadecane and acetate.
	www.iwaponline.com /wst/04601/wst046010519.htm (306 words)

	TEL :: [tel-00004617, version 1] étude expérimentale des mécanismes moléculaires de la friction fluides ...
		The experimental technique we have used to determine the slip velocity relies on measuring the mean velocity of the fluid close to the solid wall using Near Field Laser Velocimetry (NFLV).
		The systematic effect of a nanometric roughness on slippage was studied using hexadecane.
		A well controlled nanometric roughness was achieved by grafting hyperbranched polymer nanoparticules on a dense monolayer of SiH terminated oligomeres, varying the size and the surface density of the nanoparticules.
	tel.archives-ouvertes.fr /tel-00004617/en (709 words)

	Assessment of solvent toxicity
		Solvents of a highly apolar nature, such as hexadecane, were identified as being non-cytotoxic, and thus suitable for use with whole-cell systems.
		This has revealed that the cytotoxic nature of polar organic solvents, such as octan-1-ol, may be negated by dissolving them first in apolar, non-cytotoxic organic solvents, such as hexadecane, before exposure to the cell suspension.
		In order to test this contention the highly cytotoxic (relatively polar) solvent octan-1-ol was dissolved in hexadecane, with the result that the toxic effects of octan-1-ol were removed at every concentration of octan-1-ol tested (Fig 1).
	www.aber.ac.uk /~abcwww/gjsalter/2solpost.htm (1997 words)

	Alcohol for Motor Fuels
		Historically, the level of interest in using alcohol as a motor fuel has followed cycles of fuel shortages and/or low feed-grain prices.
		The properties of methyl, ethyl and butyl alcohol are compared with octane (high quality gasoline) and hexadecane (high quality diesel fuel) in Table 1.
		Note that octane and hexadecane (petroleum fuels) have higher boiling points, lower latent heats and are insoluble in water.
	www.ext.colostate.edu /pubs/farmmgt/05010.html (1309 words)

	Boris Akhremitchev Publications
		The use of these expressions to correct the associated systematic errors is illustrated by the analysis of the measured rupture forces between single hexadecane molecules in water.
		The analytical model based on the asymptotic freely jointed chain stretching is employed to analyze and correct the results of the double-tether force-spectroscopy experiments of disjoining "hydrophobic bonds" between individual hexadecane molecules that are covalently tethered via poly(ethylene glycol) linkers of different lengths to the substrates and to the AFM probes.
		Application of the correction algorithm decreases the spread of the data from the mean value, which is particularly important for measurements of the dissociation rate, and increases the barrier width to 0.43 nm, which might be indicative of the theoretically predicted hydrophobic dewetting.
	www.chem.duke.edu /~boris/publications.htm (4101 words)

	Infotrieve Online
		In the present study, we surveyed metabolites formed during growth on hexadecane by the sulfate-reducing isolates AK-01 and Hxd3 and by a mixed sulfate-reducing consortium.
		Evidence indicating hexadecane carboxylation was not found in AK-01 extracts but was observed in Hxd3 extracts.
		In the mixed sulfate-reducing culture, however, metabolites consistent with both fumarate addition and carboxylation mechanisms of hexadecane degradation were detected, which demonstrates that multiple alkane degradation pathways can occur simultaneously within distinct anaerobic communities.
	www4.infotrieve.com /newmedline/detail.asp?NameID=16751542&Session=&searchQuery=D&count=557117 (234 words)

	Abstracts
		The dosage unit was installed for the cultivation of a mixed hexadecane degrading population in a suspension of mud flat of the German North Sea in a quasi chemostatic process.
		This means that the biocenosis at 0.4% of DOT was different from the biocenosis at 80% of DOT, although the metabolic activity of the cultures was unaffected by a 200-factor difference in the oxygen tension and revealed a considerable buffer capacity with respect to changes in DOT.
		In a series of 16 experiments, hexadecane in different concentrations was mixed with natural Wadden Sea sediments, and the degradation of the alkane was observed under controlled conditions (bioreactor).
	www.uni-oldenburg.de /mikrobiologie/6431.html (4012 words)

	FDA > CDRH > CFR Title 21 Database Search
		Again, add 10 milliliters of isooctane to the residue and evaporate to 1 milliliter of hexadecane to insure complete removal of all volatile materials.
		To the residue, add a 10-milliliter portion of isooctane, reevaporate to 1 milliliter of hexadecane, and repeat this operation once.
		Quantitatively transfer the isooctane solution to a 125-milliliter flask equipped with 24/40 joint and evaporate the isooctane on the steam bath under a stream of nitrogen to a volume of 1 milliliter of hexadecane.
	www.accessdata.fda.gov /scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?fr=172.886 (3667 words)

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