Multiple Septa Research Articles

Fibrous septa in the straight dural sinus.

Postmortem exploration of the straight sinus supplemented in some cases by radiography revealed the presence of single or multiple septa or synechiae in the sinus in 44 of 145 cases. A septum should not be mistaken for a thrombus. The septa are of roentgenologic significance because of their ability to alter the appearance of the sinus from one cerebral angiography to another in one and the same patient.

The bearing of the new Late Cambrian monoplacophoran genus Knightoconus upon the origin of the Cephalopoda

Yochelson, E. L., Flower, R. H. & Webers, G. F.: The hearing of the new Late Cambrian monoplacophoran genus Knightoconus upon the origin of the Cephalopoda. Knightoconus, a new genus of the Hypseloconidae (Mollusca: Monoplacophora) from rocks of early Franconian age in Antarctica, is multiseptate. The multiple septa are a critical feature to be expected in a form ancestral to cephalopods. Fossil cephalopods, however, invariably have a siphuncle as well as septa; some gastropods, some hyolithids, and some monoplacophorans also have septa but lack a siphuncle. Therefore, only the siphuncle can be considered a unique and particularly significant feature of the cephalopod shell. Hypothetical reconstructions of molluscan anatomy support the notion that cephalopods may have been derived directly from a hypseloconid having a high, slightly curved, multiseptate, bilaterally symmetrical shell, by the subsequent development of a siphuncle.

Multiple septa of the small bowel: Description of an unusual case, with review of the literature and consideration of etiology : Edward A. Rittenhouse, J. Bruce Beckwith, John S. Chappel, and Alexander H. Bill. Surgery 71:371–379 (March), 1972

Multiple septa of the small bowel: Description of an unusual case, with review of the literature and consideration of etiology : Edward A. Rittenhouse, J. Bruce Beckwith, John S. Chappel, and Alexander H. Bill. Surgery 71:371–379 (March), 1972

NUCLEAR BEHAVIOR, SEPTATION, AND HYPHAL GROWTH OF ALTERNARIA SOLANI

Nuclei of multinucleate hyphal tip cells divided almost synchronously. Nuclear division was followed by multiple septation during which the elongated hyphal tip cell was divided into several, generally multinucleate, cells. Within the same hypha a distinct growth pattern was not observed with respect to number, length, and nuclear number of cells formed with each successive nuclear division‐septation cycle. Hyphal branches originated and received nuclei from hyphal tip cells.

Nuclear Behavior, Septation, and Hyphal Growth of Alternaria Solani

Nuclei of multinucleate hyphal tip cells divided almost synchronously. Nuclear division was followed by multiple septation during which the elongated hyphal tip cell was divided into several, generally multinucleate, cells. Within the same hypha a distinct growth pattern was not observed with respect to number, length, and nuclear number of cells formed with each successive nuclear division-septation cycle. Hyphal branches originated and received nuclei from hyphal tip cells.

Electron microscopic studies on granules ofNocardia brasiliensisin man

An electron microscopic study of granules of N. brasiliensis obtained from a human case of mycetoma is described. The granules were formed by a central zone of multiple septate filamentous structures whose morphology was similar to that of Gram-positive bacteria. A peripheral zone was identified where there were modified filaments surrounded by amorphous electron dense material. Thus the so-called “clubs” observed with a light microscope are actually the bacterial filaments surrounded by the amorphous electron dense material which most probably contains calcium phosphate salts. The host contributes with both the deposition of amorphous material and the deposition of phagocytic cells.

Multiple septation in variants of Bacillus cereus.

Remsen, C. C. (Syracuse University, Syracuse, N.Y.), and D. G. Lundgren. Multiple septation in variants of Bacillus cereus. J. Bacteriol. 90:1426-1431. 1965.-Abnormal nonsporulating cells observed in cultures containing predominantly endospores were examined in an electron microscope. One or more septa were seen which consisted of cell-wall material between two unit membranes. Numerous membrane swirls were often seen associated with the septa. Some of the reported structural features of the variant cells were similar to those published for Bacillus cereus var. alesti and B. subtilis; however, the majority of the cells observed in this work were multiseptated.