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Molecular Weight (Fig 2.6b), three 100bp ladders were run with the restriction digests in the gel and were used to standardise MW across the gel. This standardisation allowed comparison between gels. Fifthly, Band matching (Fig. 2.7), where bands were matched to themselves and common bands in a computer generated reference lane that held all the standardised values for the bands in the gel being analysed. This provided data on similarities between lanes in relation to the position of bands, which allowed phenetic similarity calculations between the patterns based on band position. This procedure was employed to produce a dendrogram showing the phenetic relatedness of the AFP active isolates ARDRA patterns. The data were then transferred to ImageMaster 1D database V2.12 (Amersham Pharmacia Biotech) to calculate a phenetic dendrogram created from the comparison of all the bands from all the lanes from more than one gel. The ARDRA patterns were matched by Rf value using the Dice similarity coefficient (Equation 2.1) and were displayed in a UPGMA (Unweighted pair group method with arithmetic averages) clustered dendrogram. SD = 2a 2a+b+c Equation 2.1 - Dice Coefficient equation. SD = coefficient of similarity based on the Dice equation; a = the number of positive matches. b and c= the number of non-matching characters between pairs of Operational Taxonomic Units (Priest and Austin, 1995). 2.9.5 - Denaturing gradient gel electrophoresis 2.9.5.1- Collection of bacterial community To obtain a community fingerprint it was necessary to obtain a concentration of the bacterial community from each lake. This was performed by filtering 120mL of lake water through a 47mm diameter, 0.2 µm mixed cellulose esters (nitrate and acetate) filter (Millipore). The biologically inert mix of nitrate and acetate make the filters ideal for cellular harvesting. The filter was stored in 1 ml of TE buffer in a 1.5m1 Eppendorf tube at -70°C. 2.9.5.2 - Genomic extraction for DGGE To provide a clean DNA template for the initial PCR step in DGGE analysis the DNA was extracted using a modified CTAB technique (Ausubel et al., 1999), which is outlined here. The stored filters in TE buffer were defrosted on ice. Once totally defrosted. the 46
Figure 2.3 - Lane delineation image from 1D elite gel analysis (Amersham Pharmacia Biotech). Each of the lanes is boxed to detail the specific areas for pixel intensity analysis. 250 90 III 70 I'I 200 ýýI I Ci'IC 60 - CL) 150 ' CID - 4w 50 C 40 100 CU Xxn - ä jj* 50 20 1 10 1 0n 0 50 100 150 0 50 100 150 *1 1 Pixel Position Pixel Position 10 - MY 117 -- AB Figure 2.4a & b. Figure A shows how the DNA bands in one lane are established by measuring pixel intensity. Figure B shows how the bands can be more clearly seen by removing the background pixel intensity using a rolling disc algorithm with a disc radius of 20. 47
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COLD ADAPTATION STRATEGIES AND DIVE
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, 71 "If you march your Winter Jour
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1.6.3. Molecular typing techniques
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3.2.1.2.3. DOC and chlorophyll a ..
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5.3.2.5. The Sphingomonas group, is
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LIST OF FIGURES Figure I. I. Diagra
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Figure 3.17a Mean bacterial abundan
Page 15 and 16: LIST OF TABLES Table 1.1. Types of
Page 17 and 18: List of Abbreviations AFP AFGP AFLP
Page 19 and 20: ACKNOWLEDGEMENTS This study was fun
Page 21 and 22: Chapter 1: INTRODUCTION 1.1 - Tempe
Page 23 and 24: 1999 ; Hand & Burton, 1981) or iden
Page 25 and 26: Cold adaptation is dependant on the
Page 27 and 28: not at 25°C is a function of the a
Page 29 and 30: The most prolific literature on col
Page 31 and 32: process known as thermal hysteresis
Page 33 and 34: dominant, role in the ice-growth in
Page 35 and 36: explanation for this diversity is t
Page 37 and 38: 1.5.3.5 - Membrane bound solute tra
Page 39 and 40: een well established (Russell & Nic
Page 41 and 42: & Bowman, 2001; Labrenz & Hirsch, 2
Page 43 and 44: The reaction mix contains both deox
Page 45 and 46: gene mixtures and hence can be used
Page 47 and 48: displaying a high number of common
Page 49 and 50: AACGTCGAAA AACCTCGAAA (Organism A)
Page 51 and 52: particular set of environmental par
Page 53 and 54: Lake Maximum Depth (m) Approximate
Page 55 and 56: Larsemann Hills __ rp3rtrnent of th
Page 57 and 58: Sampling trips took two days during
Page 59 and 60: Sigma, Sigma-Aldrich Company Ltd.,
Page 61 and 62: oxidized and the sample then conver
Page 63 and 64: sample. An appropriate volume was l
Page 65: min to ensure complete extension of
Page 69 and 70: Figure 2.6b - Molecular weights are
Page 71 and 72: RNA 41F (5'-GCT CAG ATT GAA CGC TGG
Page 73 and 74: I min. The spin column was removed
Page 75 and 76: compiled using Seqman and any erron
Page 77 and 78: ecorded and related to the level of
Page 79 and 80: information regarding the cold adap
Page 81 and 82: 50ppt to 186ppt. Thirteen were sali
Page 83 and 84: M N N 't M M \p \p 00 kf) M kf) bA
Page 85 and 86: as would normally be expected, as b
Page 87 and 88: 1444 6ý L CC vý O Q O O NO u 'c z
Page 89 and 90: 5 - 250 3 245 240 G (, -3 235 a 0-
Page 91 and 92: 3.2.2.2.5 - Dissolved organic carbo
Page 93 and 94: d 14 12 10 14 12 7 10 8 6 4 2 0 00/
Page 95 and 96: SRP ('g L- 05 10 15 20 2 3 Depth4 5
Page 97 and 98: 3.2.2.3 - Biological characteristic
Page 99 and 100: a 0 Bacterial Abundance (x 106 ml-1
Page 101 and 102: 3.3 - Discussion 3.3.1 - Summer sam
Page 103 and 104: to high surface water temperatures
Page 105 and 106: chemocline (Rankin et al., 1999). M
Page 107 and 108: a 250 200 150 100 50 70 60 50 40 ý
Page 109 and 110: The temperature (Fig 3.2a) through
Page 111 and 112: et al., 1999). No melt out was obse
Page 113 and 114: increase in ammonium is probably du
Page 115 and 116: 10 7 9 6 8 E ö 7 5 Co u c m c 40 w
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main pigments were chlorophylls a a
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Inorganic nitrogen (NO2, NO3 and NH
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744 -- 7 644 6 19 ü SE 400-- 4 2s
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salinity decreased from July to Sep
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a Bacterial abundance (x 106 1.1) 0
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8 ö a N Ö oý L _> Q O O 4 0 rn O
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undoubtedly true of Club Lake. The
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suggested that input of bacteria an
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Pendant Lake is an unstratified, sa
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non-AFP active peptides from inhibi
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. ter rý :. 'ý Figure 4.2 -Fryka
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-ý- ---- ,. r. __-_-. ___. r. ýý
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4.2 - Results 4.2.1 - Sampling and
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SPLAT score. It has been shown that
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3'E t ý _d M! .PJ r rn 15 3.5 4 3
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4.3 - Discussion Of the 866 bacteri
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arisen in very few species due to c
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Chapter 5: BACTERIAL MOLECULAR TYPI
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Fig 5.1 - Photographs of ARDRA gel
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Coefficient: Dice Algorithm: lPGMAA
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The closest published relative for
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identification was made based on 15
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Isolate number Closest phylogenetic
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e included due to its small sequenc
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5.3.2 - Identification of the AFP a
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explains the fluctuation in related
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contamination was lower as the PCR
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seen to a certain extent in the ARD
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American Type Culture Collection (A
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Phylogenetic cluster alignment of t
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et al., 1994) and the Antarctic SIM
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Chapter 6: BACTERIAL COMMUNITY ANAL
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6.2.1 - Detection of AFP active iso
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using the same PCR protocol as orig
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Figure 6.1 - Denaturing gradient ge
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6.2.2 - Temporal and spatial variat
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Figure 6.4c - Gel I image showing b
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Coefficient: Dice Algorithm: UPGMA
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etween Om and 2m was obviously the
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All PCR-based rRNA molecular techni
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6.3.2.3 - Cellular lysis and DNA pu
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hybrids should be equal. However, S
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contain contaminants. If the profil
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(Section 6.3.2.4.3 ) could not be r
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most dominant species in the commun
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study was characterised as M protea
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11 species) showed AFP activity. Th
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that AFP activity could have evolve
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7.2 - Future Work The 19 AFP active
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REFERENCES ABYZOV, S. S. (1993). Mi
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BELL, E. M. and LAYBOURN-PARRY, J.
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Symposium on Environmental Biogeoch
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Research. 5,477-493. CLESCERI, L. S
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DRICKAMER, K. (1999). C-type lectin
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antifreeze proteins from Atlantic s
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FRANZMANN, P. D. and DOBSON, S. J.
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GRIFFITH, M., ALA, P., YANG. D. S.
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IVANOVA, E. P., KIPRIANOVA, E. A.,
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Antarctic Ecosystems. G. A. Llano (
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Howard-Williams and I. Hawes). Balk
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W. (1998). Rep-PCR-mediated genomic
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putida strains from Antarctica. Mic
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NICHOLS, D., BOWMAN, J., SANDERSON,
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PEARCE, D. A. and BUTLER, H. G. (20
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(1999). Palaeohydrological modellin
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tracers of biogeochemical processes
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R. G. Landes Company, Austin, Texas
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partial 16S rDNA sequencing. Applie
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YABUUCHI, E., WANG, L., ARAKAWA, M.
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APPENDICES Al. Media Tryptic Soya A
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"D C 'O I. .. r .. r 6 rr E , 4mo .
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. + + + I I I I I I + I + + I I I I
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Ö ON N M 1 O - N 'zt "o l'" 00 C N
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1 T 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
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1 1 1 1 I 1 + I I 1 I 1 1 I 1 1 1 I
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1 1 1 1 1 1 1 I I 1 I 1 I 1 1 I T I
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Cl M 'tt tn '. p t- 00 O\ N M O - (
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d' O - (N M 'nt V) \O N. 00 O> N M
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1 1 T 1 1 1 T 1 1 1 1 1 1 1 1 1 1 1
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+ + i i i i i i " i " . + + + + " +
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e O --ý N M t Vn 1,0 [-- 00 O> N M
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FT ce + I I r. to \, O t- 00 O\ N M
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kn 110 r- 00 Oý N M O - N M Itt vn
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, It N M "t N M Iýt N M M M M Oý
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gj a - - - - - - - - - - - - - - -
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