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Para el caso de las aves inoculadas via IM, los valores de eri tuvieron una ligera disminucion en la hemoterapia y el producto comercial a las 24 y 72 hr y en la lactoterapia a los 7 y 14 d; sin embargo, los valores de ht, hb, VGM y CMHG no presentaron diferencias significativas (TABLA II).
The gas permeation coefficient, [P.sub.G] [[cm.sup.3] (STP)cm/([cm.sup.2] s cmHg)], was determined using the following equation:
The treatment schedule was a fill-cell process consisting of a 30-minute vacuum (70 cmHg), then the cylinder was filled under vacuum, followed by a pressure of 10.5 kg/[cm.sup.2] for 4 hours.
La temperatura de evaporacion se mantuvo en 50[grados]C [+ o -] 2 y la presion de vacio se establecio en 58 cmHg con ayuda de un equipo extractor de contenido gastrico (Medi-Pump, USA).
The common unit of permeance is GPU and 1 GPU is equal to 1 x [10.sup.-6] [cm.sup.3] (STP)/[cm.sup.2] s cmHg. Equation (2) can be used to calculate C[O.sub.2]/C[H.sub.4] selectivity ([alpha]), where [P.sub.i] and [P.sub.j] are C[O.sub.2] and C[H.sub.4] permeance, respectively ,
where S is the solubility coefficient of a gas in the polymer ([cm.sup.3] of gas (STP)/[cm.sup.3] of polymer cmHg), [S.sub.0] is a constant, and ([F.sup.ef.sub.g]) is the effective square of a cross sectional-area of a gas penetrant molecule.
The usual unit of permeance is GPU and 1 GPU is equal to 1 x [10.sup.-6] [cm.sup.3] (STP)/[cm.sup.2] s cmHg. Equation 3 can be used to calculate C[O.sub.2]/C[H.sub.4] selectivity ([alpha]), where [P.sub.i] and [P.sub.j] are C[O.sub.2] and C[H.sub.4] permeances respectively:
where P is the gas permeability of the membrane in Barrer (1 Barrer = 1 x [10.sup.10] [cm.sup.3] (STP)cm/[cm.sup.2]sec cmHg), v is the volume of the down-stream chamber ([cm.sup.3]), A refers to effective area of the membrane ([cm.sup.2]) and this is same selected in permeability test for the all membranes, I is the membrane thickness (cm), T is the operating temperature (K) and the feed gas pressure in the upstream is given by po in psia.
Where P is permeability in c[m.sup.3](STP) cm/[cm.sup.2] s cmHg, is effective layer of separation in c[m.sup.3], Q is gas flow in c[m.sup.3](STP)/s, A is effective membrane area in c[m.sup.2], and Ap is transmembrane pressure in cmHg.
In this work, the permeability was numerically expressed in Barrcr (1 Barrer = [10.sup.-10] ([cm.sup.3] (STP)-cm)/([cm.sup.2] * s * cmHg)).
where P (Barrer, [10.sup.-10] [cm.sup.3](STP)cm/[cm.sup.2]s cmHg) is the mean permeability coefficient of a pure penetrant, N ([cm.sup.3]/[cm.sup.2]s) is the steady-state penetrant flux through the polymer film, l (cm) is the film thickness, [P.sub.2] (3 bar) is the feed (or upstream) pressure, and [P.sub.1] (1 bar) is the permeate (or downstream) pressure.
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