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Biomedical subjects

S A Weiss

Publications and source records attributed to S A Weiss.

32 records · Page 2Linked to original sources
PubMed1982

Chemical inhibition of foamyvirus in primary baboon (Papio cynocephalus) kidney cells.

This report describes the conditions for the use of aluminum chloride (AlCl3) in growth and maintenance media for the suppression or inhibition of simian foamyviruses (SFV) in primary baboon kidney (BAK) and rabbit kidney (RK) cell cultures. When RK cells were planted in medium containing AlCl3, infected with SFV, and passaged, the growth of SFV was suppressed or inhibited by the presence of AlCl3. With this method, BAK cells yielded higher viral titers after infection with various viruses, thus making these cells more suitable for virological applications.

Aluminum↗
PubMed1981

Improved replication of Autographa californica nuclear polyhedrosis virus in roller bottles: characterization of the progeny virus.

A reproducible growth curve was established for the propagation of Autographa californica (Speyer) nuclear polyhedrosis virus (ACMNPV) In a continuous insect line from Spodoptera frugiperda (J. E. Smith) during large-volume production. A newly developed method for quantitation of polyhedra inclusion bodies (PIB) by electron microscopy (EM) during the growth cycle was compared to hemocytometer counts. The virus particles (VP) ratio to PFU and VP per PIB were established by EM methods. Optimal yields of PIB and cell-free virus with biological activities were obtained in six consecutive production lots when the growth curve conditions were followed. The DNA of the viruses produced in the 1st and 8th passages in the S. frugiperda cell line was treated with restriction endonucleases and compared with that from the E-2 cloned variant of this virus. Data confirmed that the virus was the ACMNPV and also indicated that there were no detectable changes after 8 passages in insect cell culture.

Animals↗
PubMed1980

Concentration of baboon endogenous virus in large-scale production by use of hollow-fiber ultrafiltration technology.

A process is described in which the baboon endogenous virus (BaEV) is produced under optimum conditions in cell culture, and concentrated by hollow-fiber ultrafiltration technology under conditions of large-scale production. This system has advantages over conventional systems in that the flow rate is increased 2.5-fold during concentration. Thermal inactivation of BaEV was retarded by the addition of lactose glutamate to the harvested tissue culture fluid. After concentration, at least 91% of the virus RNA-directed DNA polymerase is recovered with a concomitant increase in infectious virus. Materials needed for modifying described systems may be obtained from commercial sources.

Animals↗
PubMed1980

Chemically defined serum-free media for the cultivation of primary cells and their susceptibility to viruses.

Chemically defined media SFRE-199-1 for the growth and SFRE-199-2 for the maintenance of primary baboon kidney (Bak) cell cultures were formulated by supplementing medium M199 with insulin, sodium pyruvate, zinc sulfate, and increasing arginine-HCl, cysteine, cystine, L-glutamine, L-glutamatic acid, glycine, histidine, tyrosine, and glucose to maximally active nontoxic concentrations. For prolonged maintenance of the cells, physiological pH control, and blocking of excessive lactic acid accumulation in the spent medium of the cell cultures, it is necessary to supplement the medium containing Earle's balanced salts with D-(+)galactose. The cells grew and were maintained equally well on glass or polystyrene surfaces. Selenium, when added to growth medium or substituted for insulin and zinc sulfate, did not stimulate cell growth. Electron microscopy showed that numerous dense particles, approximately 250 to 400 A in diameter, with the appearance of glycogen, were found throughout the cytoplasm in the cells grown in SFRE-199-1 and maintained in SFRE-199-2. Echovirus types 1 to 3, poliovirus types 1 to 3, coxsackievirus types B2, B4, B5, Herpes-virus hominis type 1, simian herpesvirus H. simiae and SA8, and simian adenovirus SV34 when titrated in primary Bak cells and grown and maintained in SFRE-199-1 and 2, respectively, developed titers comparable to those obtained in conventionally grown and maintained cells.

Amino Acids↗
PubMed1974

Gliomatosis cerebri. Report of four cases and review of the literature.

Four cases of gliomatosis cerebri are reported that demonstrate the variability of the clinical course. A review of these and 32 cases from the literature revealed that the most striking finding was change in personality and mental status. Hemiparesis, ataxia, papilledema, headache, seizure, and brainstem signs were the next most common clinical findings. Laboratory and radiographic tests, including angiography and pneumoencephalography, often showed only minor and nonspecific changes in the face of profound mental deterioration. Increased intracranial pressure usually occurred late but was probably an important factor of the terminal course in most patients. The pathologic changes were typical, with diffuse infiltration of astrocytoma cells through brain stem, subcortical white matter, and, to a lesser extent, cerebral cortex.

Adult↗