Earth & Environmental Sciences
community composition
82%
Antarctica
77%
microbial community
75%
ice
60%
lake
52%
chemical
44%
library
41%
gene
34%
nitrate
32%
clone
32%
polymorphism
31%
denitrification
26%
nutrient
19%
polymerase chain reaction
17%
trace metal
14%
nitrite
13%
community structure
12%
environmental factor
12%
phylogenetics
12%
organic carbon
11%
salt
10%
oxygen
9%
water
9%
distribution
5%
parameter
5%
rate
4%
Agriculture & Biology
Antarctica
100%
ice
89%
microbial communities
85%
lakes
73%
ribosomal RNA
42%
nitrates
37%
denitrification
35%
restriction fragment length polymorphism
26%
Marinobacter
24%
clones
20%
organic carbon
16%
bacterial communities
15%
nitrites
15%
trace elements
14%
community structure
14%
chemistry
13%
nutrient content
13%
polymerase chain reaction
11%
oxygen
10%
genes
10%
salts
10%
environmental factors
9%
nucleotide sequences
9%
nutrients
8%
phylogeny
8%
sampling
5%