Within the wide biodiversity that is found in the bacterial world, Cyanobacteria represents a
unique phylogenetic group that is responsible for a key metabolic process in the biosphere …

Cyanobacteria, broadly classi¢ ed as oxygenic phototrophs containing chlorophyll-a and
accessory pigments, are among the oldest life forms on earth. They may be unicellular …

CheY-like phosphoacceptor (or receiver [REC]) domain is a common module in a variety of
response regulators of the bacterial signal transduction systems. In this work, 4,610 …

Summary 3I. introduction 4II. the cyanobacteria 7III. the heterocyst 91. Function and
metabolism 92. Heterocyst structure 12 (a) Overview 12 (b) The polysaccharide …

Nostoc punctiforme is a filamentous cyanobacterium with extensive phenotypic
characteristics and a relatively large genome, approaching 10 Mb. The phenotypic …

Many filamentous nitrogen-fixing cyanobacteria protect nitrogenase from oxygen in
differentiated cells called heterocysts. Heterocyst development is controlled by the …

Cyanobacteria are an ancient and morphologically diverse group of photosynthetic
prokaryotes, which were the first to evolve oxygenic photosynthesis. Cyanobacteria are …

Nostoc punctiforme is a phenotypically complex, filamentous, nitrogen-fixing
cyanobacterium, whose vegetative cells can mature in four developmental directions. The …

Some filamentous cyanobacteria can undergo a variety of cellular differentiation processes
that permit their better adaptation to certain environmental conditions. These processes …

When deprived of combined nitrogen, many filamentous cyanobacteria develop a one-
dimensional pattern of specialised nitrogen-fixing cells, known as heterocysts. Recent years …