• 한국미생물·생명공학회지
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• 제21권2호
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• pp.181-186
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• 1993

The functions of n-alkane inducible genes, ALI1 and POX18Cm isolated from Canida maltosa were investigated, using it's distruptants. As a result, it is suggested that ALI1 is essential for n-alkane assimilation in C. mltosa and it regulates genes related to assimilation of n-alkane (ALI1, P450alk POX18Cm) at transcriptional level. Nuclear localization experiments indicated that ALI1 was located and functioned in the nucleus. POX18Cm is considered as a peroxisomal nonspecific lipid transfer protein gene related to n-alkane assimilation in C. maltosa also regulated by ALI1. But it had no significant effect on n-alkane assimilation in C. maltosa.

• 한국미생물·생명공학회지
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• 제17권1호
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• pp.51-55
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• 1989

TOL 플라스미드와 NAH 플라스미드는 n-알칸을 자화하는 P. putida KCTC 2405에 접합에 의해 각각의 이동은 가능하나 두 플라스미드는 불화합성에 기인하여 본 균주내에 공존할 수 없었다. TOL plasmid에서 불화합성 체계는 남겨두고 tol 유전자만 이 CAM plasmid내로 transposition 되어 형성된 CAM::TOL* 플라스미드는 NAH 플라스미드와 P. putida KCTC 2405에서 공존할 수 있어 m-toluate, naphthalene, camphor 및 n-alkane(C8-C24)를 분해할 수 있는 P. putida 3SK 균주를 육종하였다. CAM::TOL* 플라스미드는 선택성 배지에서 안정하였으나 비선택성 배지에서는 불안정하였다.

• Journal of Microbiology and Biotechnology
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• 제3권4호
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• pp.252-255
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• 1993

Pseudomonas maltophilia N246 carrying on OCT plasmid grew on n-alkanes of 6 to 14 carbon atoms, but not on n-alkanes of more carbon atoms. P. maltophilia strains with and without OCT plasmid could utilize primary alcohols. aldehydes and fatty acids derived from n-alkane. The N246 strain could also utilize monocarboxylic and dicarboxylic acids, and terminal branched dimethyloctane. Unlike the genes of alcohol dehydrogenase and aldehyde dehydrogenase which were located on both the chromosome and the OCT plasmid, genes for the alkane hydroxylase components were located only on the OCT plasmid in P. maltophilia N246.

• Bulletin of the Korean Chemical Society
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• 제24권6호
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• pp.771-776
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• 2003

The structural and dynamic properties of small n-alkane clusters embedded in a mesoscopic solvent are investigated. The solvent interactions are taken into account through a multi-particle collision operator that conserves mass, momentum and energy and the solvent dynamics is updated at discrete time intervals. The cluster molecules interact among themselves and with the solvent molecules through intermolecular forces. The properties of n-heptane and n-decane clusters interacting with the mesoscopic solvent molecules through repulsive Lennard-Jones interactions are studied as a function of the number of the mesoscopic solvent molecules. Modifications of both the cluster and solvent structure as a result of cluster-solvent interactions are considered. The cluster-solvent interactions also affect the dynamics of the small n-alkane clusters.

• 미생물학회지
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• 제32권2호
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• pp.172-175
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• 1994

Xanthomonas campestris M12는 octane을 분해할 수 있는 OCT 플라스미드를 갖고 있으며, 이 플라스미드의 분해 능력으로 $C_8$에서 $C_{16}$까지의 n-alkane을 이용할 수 있었다. X. campestris M12 균주는 n-alkane을 이용하여 alcohol, aldehyde, fatty acid를 거쳐서 분해할 수 있으나 heanoic acid, adipic acid, pimelic acid 그리고 heptanal은 이용할 수 없었다. 또한 이 균주는 straight fatty acids의 monoterminal oxidation과 diterminal oxidation에 의하여 n-alkane을 분해할 수 있으며, branched-chain alkane도 이용할 수 있었다.

• 대한환경공학회지
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• 제22권10호
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• pp.1851-1859
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• 2000

원유를 분해하는 미생물을 석유화합물로 오염된 토양으로부터 분리하였고, 이들은 Acinetobacter sp. A132, Pseudomonas putida A422, Pseudomonas aeruginosa F721, F722, 그리고 Xanthomonas maltophilia B823으로 동정되었다. 이들 미생물의 유류 분해율을 조사한 결과, strain A132가 $6.04g/L{\cdot}day$로 가장 놓은 분해율을 나타내었다. 탄소수가 10개에서 32개 사이의 n-alkane 화합물을 기질로 사용하여 각각의 화합물에 대한 분해능력을 조사한 결과, strain A132와 F722는 대부분의 기질에 대하여 분해능력을 보였다. Strain A422는 n-alkane 화합물에 대한 분해능력은 높지 않았으나, benzene과 xylene을 분해하는 능력을 가지고 있었다. Strain B823은 원유에서는 조금 생장하였으나, 본 연구에서 사용한 다른 기질들에 대해서는 전혀 분해능력을 보이지 않았다. 한편, n-alkane 혼합화합물에 대한 분해율을 GC/FID로 분석한 결과, strain F722는 $nC_7{\sim}nC_{10}$에서 100%, $nC_{11}{\sim}nC_{24}$에서는 80% 이상 의 높은 분해율을 나타내었다.

• 미생물학회지
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• 제21권4호
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• pp.185-190
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• 1983

Twelve Microorganisms capable of utilizing diaminododecane were isolated from the soil by enrichment culture technique. Seven strains of these were identified as Corynebacterium. The isolated strains were tested for the ability to utilize as carbon source, 10 different kind of alkane derivatives containing CN, $NH_2$, Cl, and SH groups. Laurylcyanide, dicyanooetane, chlorodecane, and dichlorodecane were not utilized by any of the isolated strains; putrescine dihydrochloride, cadaverine dihydrochloride, diaminododecane, and n-dodecane were utilized by all of the isolated strains; and all of the isolated strains except DAD 2-3 could utilize dodecylmercaptan. The alkane derivatives that did not serve as ,growth substrates were tested further in oxidation tests using resting cell preparation. Alkane derivatives that are being oxidized by all of the isolated strains are laurylcyanide and dichlorodecane. Dicyanooctane was also oxidized by all of the isolated strains except DAD 30L, chlorodecane was the only oxidized by the three isolated strains. The most remarkable substrate that is being oxidized is dichlorodecane containing CN groups diterminally. Evidence obtained with thin layer chromatography of ,ethyl acetate extracts of culture broth of isolated strains grown in some alkane derivatives shows that these alkane derivatives are degraded.

• Elastomers and Composites
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• 제38권1호
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• pp.51-56
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• 2003

Cloud-point and bubble-point data to $170^{\circ}C$ and 50 bar are presented for four different solvents, normal pentane. n-hexane, n-heptane, and n-octane with poly(ethylene-co-42 wt% octene) ($PEO_{42}$) copolymer. The pressure-concentration isotherms measured for $PEO_{42}$ - normal pentane have maximums at around 5 wt% of the copolymer concentrations in the solution. $PEO_{42}$- normal pentane system exhibits LCST-type phase behavior at temperatures greater than $130^{\circ}C$. Below $120^{\circ}C$, bubble-point type transitions are observed. However, the binary mixtures for $PEO_{42}$ in n-hexane, n-heptane, and n-octane have only bubble-point type transitions at the pressure-temperature region investigated in this study. The single-phase region of PEO - alkane mixtures increases with the molecular size of alkane solvent due to the increasing dispersion interactions between PEO and the alkane.

• Asian-Australasian Journal of Animal Sciences
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• 제23권1호
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• pp.61-67
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• 2010

The chemical components in plant cuticular wax can be used as markers to estimate the species composition of the diet of grazing animals. In this experiment, composition of the diet of yak on the Qinghai-Tibetan plateau was estimated using n-alkane analysis. During the grazing period, samples of whole plants of the species present, plus fecal samples voided by the yak, were collected, air-dried and ground prior to the extraction of cuticular wax n-alkanes. The species composition of the yak diets was estimated by relating fecal alkane contents to those of the plant species, using the 'ATWHAT'software package. The results showed that the n-alkane technique can detect the main dietary components selected by yak. The diet consumed by yak contained 33% Kobresia humilis, 67% Stipa aliena in summer pasture; 26% Potentilla anserine, 74% Carex qinghaiensis in autumn pasture; 52% Carex qinghaiensis, 32% Heteropappus bowerii and 16% Saussurea semifasciata in winter pasture and 5% Carex qinghaiensis, 95% Achnatherum splendens in spring pasture. The apparent selection for forbs is likely to be a reason for nutritional constraint of yak inhabiting alpine environments.

• Bulletin of the Korean Chemical Society
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• 제32권11호
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• pp.3909-3913
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• 2011

In this paper we have carried out molecular dynamics simulations (MD) for model systems of liquid n-alkane oligomers ($C_{12}{\sim}C_{80}$) at high temperatures (~2300 K) in a canonical ensemble to calculate viscosity ${\eta}$, self-diffusion constants D, and monomeric friction constant ${\zeta}$. We found that the long chains of these n-alkanes at high temperatures show an abnormality in density and in monomeric friction constant. The behavior of both activation energies, $E_{\eta}$ and $E_D$, and the mass and temperature dependence of ${\eta}$, D, and ${\zeta}$ are discussed.