ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Comparative study on the cell wall structure of protein-producing Bacillus brevis (1988)

Gruber, Karin ; Tanahashi, Hiroyuki ; Tsuboi, Akio ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

FEMS microbiology letters 56 (1988), S. 0

add to mindlist on the mindlist

Details

ISSN: 1574-6968

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Abstract Among eight strains of protein-producing Bacillus brevis, three morphological groups have been identified according to the structure of the cell walls.〈list xml:id="l1" style="custom"〉(I)Cell wall consisting of a peptidoglycanlayer(II)Two-layered cell wall consisting of a peptidoglycan-layer and an S-layer(III)Three-layered cell wall consisting of a peptidoglycan-layer and two S-layersGroup I and group II cell walls have not been described yet for protein-producing bacteria. The S-layers observed in this study all had hexagonal symmetry and lattice constants of approximately 18 nm. The immunological relation between the S-layer proteins of the newly isolated B. brevis strains and those of B. brevis 47 has been examined using antisera against both S-layer-proteins of B. brevis 47. S-layers from protein-producing B. brevis strains, which were adjacent to the peptidoglycan-layer, were similar to each other, whether they were the outermost cell wall layer (group II) or not (group III). However, no similarity was found between these layers and the outermost S-layer of B. brevis 47 (group III).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1574-6968.1988.tb03160.x

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Network formation in poly(ethylene terephthalate) by thermooxidative degradation (1970)

Yoda, Kentaro ; Tsuboi, Akio ; Wada, Minoru ; [et al.]

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 14 (1970), S. 2357-2376

add to mindlist on the mindlist

Details

ISSN: 0021-8995

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Gelation of poly(ethylene terephthalate) by heating at 263°-300°C was investigated. Under nitrogen flow, crosslinks were scarcely formed. However in air, degradation and crosslinking were common, and these were accelerated by purging gaseous and sublimable degradation products out of the system with a stream of air. The main component of the sublimate was terephthalic acid. Infusible and insoluble gel was treated with methanol at 260°C, and then the methanolysis products were separated into two parts. The methanol-insoluble part exhibited a polyene structure with ester groups, and the methanol-soluble part contained dimethyl terephthalate, ethylene glycol, and some 1,2,4-butanetriol. To clarify the relation between the crosslinking and the formation of vinyl ester groups, the degradation of vinyl methyl terephthalate was studied. Thermoxidative degradation of linear polyesters other than poly(ethylene terephthalate) was also studied. Poly(ethylene isophthalate) and poly(ethylene sebacate) were easily gelated. However, poly(trimethylene terephthalate) and poly(neopentyl terephthalate) were scarcely gelated. The primary reaction leading to crosslinking is assumed as follows. At first, the random scission of polyester chain may take place forming carboxylic acids, vinyl esters, aldehydes, etc. After accumulation of vinyl esters to some extent, vinyl polymerization of the esters takes place and network structures are formed.

Additional Material: 14 Ill.