Membrane average diameters

The smaU nucleus of the yeast ceU is surrounded by a membrane or tonoplast, which has many pores with an average diameter of about 0.085 p.m. 

If the pressure drop across a tubular membrane is 2.8 bars, determine the permeat velocity across the membrane module. The thickness and the porosity of the deposit are 2 mm and 40 %, respectively. The average diameter of the partices is 5 microns. The initial membrane resistance is estimated to be 1.7 X 10 1/m. 

PLATELETS. Platelets are nonnucleated discoid or elliptical cells that originate from the fragmentation of giant polyploid megakaryocytes located in the bone marrow. The average diameter of the platelet is 1.5 pm. Each platelet is surrounded by a trilaminar membrane, and its cytoplasm contains a dense body (delta granule), a surface-connected canalicular system,... 

Fig. 3.1 Schematic diagram of the human respiratory system. The gross anatomy of the lung, the covering membranes (pleura), airways and air sacs (alveoli) are shown. The average diameter of portions of the air flow system are indicated trachea, 20 mm bronchus, 8 mm terminal and respiratory bronchioles, 0.5 mnn alveolar duct, 0.2 mm alveolar sacs, 0.3 mm.

The preparation of monodisperse hydrogel microspheres, such as poly-acrylam-ide-co-acrylic acid, poly(N-isopropylacrylamide-co-acrylic acid), has been performed for drug devices thanks to their biocompatibility [77, 79]. The average diameters of the microspheres were dependent on the pore sizes (from 0.33 to 1.70pm) of SPG membranes used in the preparation procedure. 

Tab. 4.32 Molecular parameters describing the (glyco)lipids constituting the bilayer leaflet at the side of PMB addition of various asymmetric planar bilayers (the second leaflet was always made from the phospholipid mixture) and the average diameters of the induced membrane lesions. (Reprinted from Tab. 1 of ref. 117 with permission from Bertelsmann-Springer.)...

Carbon Dioxide Permeation, k, and Membrane Average Pore Diameter, t/v... 

Abundance of channels may contribute theoretically to a general permeability or leakiness of the ER membrane, which has been demonstrated in case of the ribosome-bound translocon complex, which cotranslationally imports nascent peptides into the RER lumen (51). The average diameter of the translocon tunnel is approximately 20 A, which is wide enough to allow the transport of Ca + (52) and small water-soluble molecules (4-6). Therefore, the presence of translocon complexes might be responsible for the higher permeability of the RER membrane versus the SER membrane. 

Fig. 3. Visualization of the liposome morphology and size distribution determined with AFM and NanoZS. (a, b) Pure phospholipon liposomes adhered on silicon wafer as substrate. The liposomes have diameters between 80 and 250 nm with an average diameter of 178 12 nm. The liposomes tend to spread to the surface, because of the low membrane stability, (c) Pure GDNT liposomes with an average diameter of 137 8 nm (PDI 0.295 0.017) and a zeta potential of -15.3 0.60 mV. The liposomes are stable and show a spherically, round shape, (d) Size distribution of the pure GDNT liposomes measured with NanoZS...

---