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In low nitrogen environments, heterocyst differentiation is triggered by the transcriptional regulator NtcA. NtcA influences heterocyst differentiation by signaling proteins involved in the process of heterocyst differentiation.
The mechanisms of reproductive isolation are a collection of evolutionary mechanisms, behaviors and physiological processes critical for speciation.They prevent members of different species from producing offspring, or ensure that any offspring are sterile.
The cell is the basic structural and functional unit of all forms of life.Every cell consists of cytoplasm enclosed within a membrane; many cells contain organelles, each with a specific function.
Cell damage (also known as cell injury) is a variety of changes of stress that a cell suffers due to external as well as internal environmental changes. Amongst other causes, this can be due to physical, chemical, infectious, biological, nutritional or immunological factors.
Masayo Takahashi (高橋 政代, Takahashi Masayo, born June 23, 1961) is a Japanese medical physician, ophthalmologist and stem cell researcher.. Takahashi serves as a project research leader at the Riken Center for Developmental Biology in Kobe focusing on the clinical application of iPS Cell (induced Pluripotent Stem Cell) technology on macular degeneration.
Variability of the Painted snail. Shells of Polymita picta can reach a length of about 20 millimetres (0.79 in). These large shells are shiny and very brightly colored. Normally they show a bright yellow color with a white stripe, [according to whom?] but the species is well known for its colourful shell polymorphism, with numerous color vari