quantum numbers and atomic orbitals

I- quantum numbers : L'état d'un électron dans un atome, c'est-à-dire : its energy, its movements around the core, la forme de l'orbitale, is defined...

ulna bone (ULNA)

I- Introduction : The ulna shape with the radius of the two bones Lavant arm. C'est l'os interne de l'avant-bras. It is even, long. Il s'articule...

Hand Skeleton

I- Introduction : The skeleton of the hand is formed of 3 parties : the carp: responsive to the wrist  the pastern: which forms the palm of ...

cell adhesion

Cell adhesion is an essential function that higher organisms have acquired to allow tissue formation, organes et systèmes qui s’efforcent...

Cytosquelette

The three main fibers of the cytoskeleton are microfilaments, microtubules and intermediate filaments. Ces fibres interagissent pour moduler la forme et permettre...

Cellular membrane

COMPOSITION AND STRUCTURE : In all eukaryotes cells, compartmentalization is observed due to biological membranes. Cell compartmentalization allows separation of functions ...

Methods & rsquo; cell study

Introduction : The cell is the basic structural unit and functional living organisms and because of its small size, cell biology. all...

intercellular communication through chemical signals

1- Introduction : Intercellular communication is one of the features of multicellular organisms, provided by chemical molecules (informative or messengers molecules) issued by a ...

glycoproteins

1- Definition : These are heteroproteins resulting from the union of a carbohydrate moiety (de type oligosides) and protein by covalent bonds. They are very ...

Glycosaminoglycanes

Definition : These are heterogeneous polysaccharides resulting from the polycondensation under disaccharide units (or disaccharide) Elementary consists of : -a carrier hexosamine molecule..