Agriculture & Biology
Columbia River
100%
estuaries
76%
isotope fractionation
45%
nitrates
32%
phytoplankton
25%
oceans
25%
nitrogen
19%
Ciliophora
19%
Mesodinium
17%
water
16%
phosphorus
16%
underwater vehicles
14%
particulate organic matter
14%
sediments
14%
dissolved oxygen
13%
nephelometry
13%
rivers
13%
oxygen
13%
metformin
12%
tides
12%
pollution load
12%
oxygen isotopes
11%
turbidity
11%
nitrogen-fixing cyanobacteria
11%
polyphosphates
11%
secondary productivity
11%
Pacific Ocean
10%
isotopes
10%
methylmercury compounds
10%
phylotype
10%
Appalachian region
10%
nitrogen-fixing bacteria
9%
sensors (equipment)
9%
Chlorella vulgaris
9%
nutrients
9%
turgor
9%
biogeochemical cycles
8%
plankton
8%
metabolism
8%
organic matter
8%
indicator species
8%
nitrogen fixation
8%
Cyanobacteria
8%
photoperiod
7%
algae
7%
Bacillariophyceae
7%
bacterioplankton
7%
iron
6%
growth performance
6%
Thalassiosira
6%
Earth & Environmental Sciences
estuary
57%
river
38%
nitrogen isotope
36%
nitrate
33%
fractionation
30%
phytoplankton
28%
fixation
23%
algal bloom
20%
isotope
19%
nitrogen fixation
19%
assimilation
16%
sensor
16%
cyanobacterium
15%
rate
13%
metabolism
12%
ciliate
12%
ocean
12%
nutrient
11%
particulate organic matter
10%
agricultural catchment
10%
nutrient cycle
10%
in situ
10%
autonomous underwater vehicle
10%
secondary production
10%
cell
10%
phosphorus
9%
North Pacific Ocean
9%
dissolved organic carbon
9%
dissolved organic matter
9%
global ocean
9%
turbidity
9%
methylmercury
9%
rift zone
8%
nitrogen
8%
sediment
8%
water
8%
vesicle
8%
residence time
8%
oxygen isotope
7%
plankton
7%
iron
7%
organic matter
7%
water column
6%
oxygen
6%
organism
6%
tide
6%
stable isotope
6%
alga
6%