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Article Contents

ABSTRACT

1.INTRODUCTION: CHEMICAL VARIATIONS IN GALACTIC NUCLEI

2.TARGETED VS. UNBIASED SURVEYS

3.RECEIVER BANDWIDTH UPGRADES: ONGOING SURVEYS

4.GOING WIDER: HIGH REDSHIFT WIDE BAND RECEIVERS

5.ABSORPTION SYSTEMS

6.THE CHEMISTRY IN THE ARP 220 ULIRG

7.MOLECULAR CENSUS EVOLUTION

8.HIGH RESOLUTION LINE SURVEYS

REFERENCES