Researchers' notions of research quality depend on their field of research. Previous studies have shown that field-specific assessment criteria exist but could explain neither why these specific criteria and not others exist, nor how criteria are used in specific assessment situations. To give initial answers to these questions, formal assessment…

Reviewed is the current state of research in the field of nitrogen fixation in plants. Stressed are the potential gains to be realized in the area of increased food production. (SL)

Discusses the biochemical mechanisms related to photosynthesis. Describes a water-oxidizing clock generating a molecule of oxygen with every four ticks. Lists four references. (YP)

Discusses various topics and issues related to the scientific enterprise in Cuba. Notes that Cuban science is emphasizing biotechnology and research on the island's chief crop (sugarcane), although hampered by limited personnel and lack of modern laboratory equipment. (JN)