Spatial dynamics of transport accessibility and regional efficiency in the Yangtze River Delta Urban Agglomeration.

Transport accessibility is crucial for defining urban clusters and evaluating a region's centrality and connectivity. To foster equitable growth in urban conglomerates, it is crucial to understand the relationship between transport accessibility and regional development. This study introduces the concept of 'regional efficiency'-the effectiveness of converting regional inputs into outputs-determined via the super-efficiency Data Envelopment Analysis methodology, to assess the progression of regional development.

Cloning and sequencing of the gene encoding variant-specific surface antigen from Giardia lamblia.

Objective: To clone and sequence variant-specific surface antigen gene from Giardia lamblia isolate SUCH/89/BTMR/2(C2) derived from human in China.

Methods: Total genomic DNA of G. lamblia was extracted and a full-length variant-specific surface antigen gene fragment was amplified by polymerase chain reaction (PCR).