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Kommentierte Bibliographie englischer literarischer Testamente vom 14. bis zum 20. Jahrhundert
(1982)
No abstract available
We have cloned the chromosomal hemolysin determinants from Escherichia coli strains belonging to the four O-serotypes 04, 06, 018, and 075, The hemolysin-producing clones were isolated from gene banks of these strains which were constructed by inserting partial Sau3A fragments of chromosomal DNA into the cosmid pJC74. The hemolytic cosmid clones were relatively stable. The inserts were further sub cloned either as Sail fragments in pACYC184 or as BamHI-SaLI fragments in a recombinant plasmid (pANN202) containing cistron C (hlye) of the plasmid-encoded hemolysin determinant. Detailed restriction maps of each of these determinants were constructed, and it was found that, despite sharing overall homology, the determinants exhibited minor specific differences in their structure, These appeared to be restricted to cistron A (hlyA), which is the structural gene for hemolysin. In the gene banks of two of these hemolytic strains, we could also identify clones which carried the genetic determinants for the mannose-resistant hemagglutination antigens Vb and VIc. Both of these fimbrial antigens were expressed in the E. coli K-12 clones to an extent similar to that observed in the wild-type strains. These recombinant cosmids were rather unstable, and, in the absence of selection, segregated at a high frequency.
Die Kristallstruktur von 4.CH\(_3\)(C\(_6\)H\(_4\))-TI(S\(_2\)CN(C\(_2\)H\(_5\))\(_2\))\(_2\) (P2\(_1\)/c, a = 11,973(3) A, b = 10,692(3) A, c = 19,232(4) A, ß = 114,02(2)°, Z = 4) und C\(_6\)H\(_5\)-Bi(S\(_2\)COCH\(_3\))\(_2\) (P2\(_1\)/c, a = 6,395(2) A, b = 24,684(8) A, c = 9,732(3) A, ß = 101,38(3)°, Z = 4) konnte aus Röntgendiffraktometerdaten von Einkristallen ermittelt werden. Die interatomaren Abstände zeigen daß, die Koordination von Dithiocarbamat und Xanthogenat an die Metallatome wie schon vermutet stark asymmetrisch zweizähnig und ausschließlich über Schwefel erfolgt. Die Koordinationsunter· schiede zwischen Bismut und Thallium ergeben ein deutliches Indiz für die "stereochemische Aktivität" des freien Elektronenpaares am Bismutatom.
No abstract available
No abstract available
No abstract available
No abstract available
The role of macrophages in primary and secondary infection of mice with Salmonella typhimurium
(1982)
Elimination of macrophages with high-molecular dextran sulphate (OS) markedly impairs resistance of mice to primary infection with smooth, virulent strains of Salmonella typhimurium, whereas stimulation of this system by killed Bordetella pertussis organisms increases resistance. In infection with rough, avirulent strains of S. iyphimurium the elimination of macro phages was not followed by an essential loss of resistance, and it appears that other non-specific defence mechanisms, for example the complement system, may have compensated for the lack of macrophages. Macrophages, therefore, play an important role in defence during primary infection with virulent strains. In immunity to challenge infection with S. typhimurium, macrophages play an even more significant role. Treatment with OS completely removes immunity, and both humoral and cell-mediated immune mechanisms seem to require the participation of macrophages.