Shallow‐marine carbonate cementation in Holocene segments of the calcifying green alga Halimeda

Rapid Mass Movement of Chloroplasts during Segment Formation of the Calcifying Siphonalean Green Alga, Halimeda macroloba

BACKGROUND The calcifying siphonalean green alga, Halimeda macroloba is abundant on coral reefs and is important in the production of calcium carbonate sediments. The process by which new green segments are formed over-night is revealed here for the first time. METHODOLOGY/PRINCIPAL FINDINGS Growth of new segments was visualised by epifluorescence and confocal microscopy and by pulse amplitud...

The effects of phosphate on the biomineralization of the green alga, Halimeda incrassata (Ellis) Lam

Experiments in Calcium Carbonate Cementation

Carbonate sediments may be cemented by a variety of forms of aragonite. calcite. or dolomite. The mineralogy of the cement has been regarded by most investigators as the product of the physico-chemical environment within the sediment at the time of cementation. This has been a reasonable working hypothesis until it was recently demonstrated that many different kinds of cement may occur in beach...

Phototaxis and aerotaxis in a calcifying alga.

The coccolithophore, Pleurochrysis carterae, is a unicellular marine alga, with an outer covering of scales known as coccoliths, instead of a cell wall (Figure 1; 1). Coccoliths are composed of calcium carbonate (CaCO3) in the form of calcite, and are formed intracellularly in the Golgi cisternae in a very precise and well defined process before being positioned outside the cell membrane (1). B...

the effect of the record infancy in crimilly acts of guilties (in karaj city)

چکیده یکی از مهمترین دغدغه های بزرگ جوامع بشری، از دیر باز تا کنون که ذهن پژوهشگران و متخصصان بهداشت روانی و اجتماعی و دولتها رابه خود مشغول داشته، مسأله ی بزهکاری می باشد. شناخت کامل پدیده ی بزهکاری و بزهکار، علل وعوامل سقوط یک انسان، چگونگی درمان وی و درنهایت پیشگیری ازبزهکاری ودریک کلام سالم سازی یک جامعه، رسالت عظیم، انسانی ومقدسی می باشد که با بررسی شخصیت مجرم یعنی[ انسانی که تحت شرای...