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BLAST search. In fact it showed a 100% sequence similarity to :I primoryensis. However, it was not possible to make a definitive identification based on only 173 bp of the 16S rRNA gene (Ercolini et al., 2001 a). 164
Figure 6.1 - Denaturing gradient gel electrophoresis acrylamide gel showing 10 highly AFP active Antarctic lake bacterial isolates against 3 community profiles from the lakes from which they were isolated. Lanes 1-3 comprise community profiles: Lane I- Ace Lake 8m November; Lane 2- Pendant Lake lOm November; Lane 3- Triple Lake 8m November. Lanes 4-14 comprise 16S rDNA V3 region patterns for individual cultivated species: Lane 4- isolate 213; Lane 5- isolate 492; Lane 6- isolate 53; Lane 7- isolate 732; Lane 8- isolate 302; Lane 9- isolate 154; Lane 10 - isolate 54; Lane 11 - isolate 744; Lane 12 - isolate 494; Lane 13 - isolate 794; Lane 14 - Marinomonas proiea. For details of gel composition and running conditions refer to section 2.9.5.4. Figure 6.2 Denaturing - gradient gel electrophoresis acrylamide gel showing 9 representatives of phena identified within the AFP active isolate grouping (except Marinomonasprolea related species) against 4 community profiles from the lakes from which they were isolated. Lanes 1-9 comprise 16S rDNA V3 region patterns for individual cultivated species: Lane I- isolate 466; Lane 2- isolate 47; Lane 3- isolate 302; Lane 4- isolate 492; Lane 5- isolate 53; Lane 6- isolate 732; Lane 7- isolate 494; Lane 8- isolate 86; Lane 9- isolate 583. Lanes 10-13 comprise DGGE community profiles: Lane 10 - Ace Lake 4m September; Lane 11 - Pendant Lake Om September; Lane 12 - Pedant Lake I Om September; Lane 13 - Triple Lake 4m September. 165
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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
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LIST OF TABLES Table 1.1. Types of
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List of Abbreviations AFP AFGP AFLP
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ACKNOWLEDGEMENTS This study was fun
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Chapter 1: INTRODUCTION 1.1 - Tempe
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1999 ; Hand & Burton, 1981) or iden
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Cold adaptation is dependant on the
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not at 25°C is a function of the a
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The most prolific literature on col
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process known as thermal hysteresis
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dominant, role in the ice-growth in
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explanation for this diversity is t
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1.5.3.5 - Membrane bound solute tra
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een well established (Russell & Nic
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& Bowman, 2001; Labrenz & Hirsch, 2
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The reaction mix contains both deox
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gene mixtures and hence can be used
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displaying a high number of common
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AACGTCGAAA AACCTCGAAA (Organism A)
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particular set of environmental par
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Lake Maximum Depth (m) Approximate
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Larsemann Hills __ rp3rtrnent of th
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Sampling trips took two days during
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Sigma, Sigma-Aldrich Company Ltd.,
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oxidized and the sample then conver
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sample. An appropriate volume was l
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min to ensure complete extension of
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Figure 2.3 - Lane delineation image
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Figure 2.6b - Molecular weights are
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RNA 41F (5'-GCT CAG ATT GAA CGC TGG
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I min. The spin column was removed
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compiled using Seqman and any erron
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ecorded and related to the level of
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information regarding the cold adap
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50ppt to 186ppt. Thirteen were sali
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M N N 't M M \p \p 00 kf) M kf) bA
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as would normally be expected, as b
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1444 6ý L CC vý O Q O O NO u 'c z
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5 - 250 3 245 240 G (, -3 235 a 0-
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3.2.2.2.5 - Dissolved organic carbo
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d 14 12 10 14 12 7 10 8 6 4 2 0 00/
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SRP ('g L- 05 10 15 20 2 3 Depth4 5
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3.2.2.3 - Biological characteristic
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a 0 Bacterial Abundance (x 106 ml-1
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3.3 - Discussion 3.3.1 - Summer sam
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to high surface water temperatures
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chemocline (Rankin et al., 1999). M
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a 250 200 150 100 50 70 60 50 40 ý
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The temperature (Fig 3.2a) through
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et al., 1999). No melt out was obse
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increase in ammonium is probably du
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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
Page 133 and 134: Pendant Lake is an unstratified, sa
Page 135 and 136: non-AFP active peptides from inhibi
Page 137 and 138: . ter rý :. 'ý Figure 4.2 -Fryka
Page 139 and 140: -ý- ---- ,. r. __-_-. ___. r. ýý
Page 141 and 142: 4.2 - Results 4.2.1 - Sampling and
Page 143 and 144: SPLAT score. It has been shown that
Page 145 and 146: 3'E t ý _d M! .PJ r rn 15 3.5 4 3
Page 147 and 148: 4.3 - Discussion Of the 866 bacteri
Page 149 and 150: arisen in very few species due to c
Page 151 and 152: Chapter 5: BACTERIAL MOLECULAR TYPI
Page 153 and 154: Fig 5.1 - Photographs of ARDRA gel
Page 155 and 156: Coefficient: Dice Algorithm: lPGMAA
Page 157 and 158: The closest published relative for
Page 159 and 160: identification was made based on 15
Page 161 and 162: Isolate number Closest phylogenetic
Page 163 and 164: e included due to its small sequenc
Page 165 and 166: 5.3.2 - Identification of the AFP a
Page 167 and 168: explains the fluctuation in related
Page 169 and 170: contamination was lower as the PCR
Page 171 and 172: seen to a certain extent in the ARD
Page 173 and 174: American Type Culture Collection (A
Page 175 and 176: Phylogenetic cluster alignment of t
Page 177 and 178: et al., 1994) and the Antarctic SIM
Page 179 and 180: Chapter 6: BACTERIAL COMMUNITY ANAL
Page 181 and 182: 6.2.1 - Detection of AFP active iso
Page 183: using the same PCR protocol as orig
Page 187 and 188: 6.2.2 - Temporal and spatial variat
Page 189 and 190: Figure 6.4c - Gel I image showing b
Page 191 and 192: Coefficient: Dice Algorithm: UPGMA
Page 193 and 194: etween Om and 2m was obviously the
Page 195 and 196: All PCR-based rRNA molecular techni
Page 197 and 198: 6.3.2.3 - Cellular lysis and DNA pu
Page 199 and 200: hybrids should be equal. However, S
Page 201 and 202: contain contaminants. If the profil
Page 203 and 204: (Section 6.3.2.4.3 ) could not be r
Page 205 and 206: most dominant species in the commun
Page 207 and 208: study was characterised as M protea
Page 209 and 210: 11 species) showed AFP activity. Th
Page 211 and 212: that AFP activity could have evolve
Page 213 and 214: 7.2 - Future Work The 19 AFP active
Page 215 and 216: REFERENCES ABYZOV, S. S. (1993). Mi
Page 217 and 218: BELL, E. M. and LAYBOURN-PARRY, J.
Page 219 and 220: Symposium on Environmental Biogeoch
Page 221 and 222: Research. 5,477-493. CLESCERI, L. S
Page 223 and 224: DRICKAMER, K. (1999). C-type lectin
Page 225 and 226: antifreeze proteins from Atlantic s
Page 227 and 228: FRANZMANN, P. D. and DOBSON, S. J.
Page 229 and 230: GRIFFITH, M., ALA, P., YANG. D. S.
Page 231 and 232: IVANOVA, E. P., KIPRIANOVA, E. A.,
Page 233 and 234: 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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