526
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Avtalion RR, Weiss E, Moalem T, Milgrom L. Proceedings: Evidence for cooperation of T and B cells in fish. ISRAEL JOURNAL OF MEDICAL SCIENCES 1975; 11:1385. [PMID: 1082879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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527
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Thirase G, Weiss E, Hennig HJ, Lechert H. Pr�parative, r�ntgenographische und1 H-Breitlinienresonanzuntersuchungen an Germylalkaliverbindungen, GeH3 M. Z Anorg Allg Chem 1975. [DOI: 10.1002/zaac.19754170306] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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528
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Weiss E, Coolbaugh JC, Williams JC. Separation of viable Rickettsia typhi from yolk sac and L cell host components by renografin density gradient centrifugation. Appl Microbiol 1975; 30:456-63. [PMID: 810089 PMCID: PMC187203 DOI: 10.1128/am.30.3.456-463.1975] [Citation(s) in RCA: 115] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Rickettsia typhi cultivated in the yolk sac of chicken embryos or in L cells irradiated 7 days previously was separated from host cell components by two cycles of Renografin density gradient centrifugation. Preliminary steps involved differential centrifugation and centrifugation over a layer of 10% bovine plasma albumin of infected yolk sac suspensions, or trypsinization and passage through filters of wide porosity of infected L cell suspensions. Rickettsial preparations obtained by these methods appeared to be free from host cell components while retaining high levels of hemolytic activity, egg infectivity, and capacity to catabolize glutamate. Average yields were 3.3 mg of rickettsial protein per yolk sac or 0.44 mg per 16-oz (ca. 475-ml) L cell culture. Extracts from these two preparations displayed malate dehydrogenase activity of electrophoretic mobility identical to each other but quite different in migration patterns from the corresponding host cell enzymes. This method of separation of rickettsiae from host cell constituents appears to be particularly well suited for the study of rickettsial enzymatic activity.
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529
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Reinacher M, Weiss E. Electron microscopical study of initial and final stages of fowl plague virus-replication in chick embryo cells. Arch Virol 1975; 49:187-97. [PMID: 1239990 DOI: 10.1007/bf01317537] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Cellular uptake of fowl plague virus occurs 10-30 minutes after inoculation of chick embryo cells. The penetration of the virions is by pinocytosis (viropexis); fusion with the cellular membrane has not been observed. After pinocytosis the virions become gradually disintegrated. Budding of newly formed virions from the cellular membrane starts 3 hours post inoculation (p.i.) and reaches its maximum 8 hours p.i. At the same time budding takes place into electron microscopically empty and autophagic vacuoles. Eight hours p.i. about 3 per cent of the infected cells show budding of virions from the surface and into cytoplasmic vacuoles. Labelling of the cellular membrane with ruthenium red demonstrated that these cytoplasmic vacuoles are not simple cross-sections of invaginations of the cellular membrane. Cluster-like structures were found at 6 hours p.i. in the nuclei of infected cells; however, the suggestion that the clusters develop from nucleoli could not be confirmed.
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530
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Kraft B, Klaus B, Petri K, Weiss E. [Occurence of the Maedi disease in sheep slaughtered at the Frankfurt/Main abbatoirs]. DTW. DEUTSCHE TIERARZTLICHE WOCHENSCHRIFT 1975; 82:31-4. [PMID: 163180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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531
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Abstract
Neisseria gonorrhoeae was cultivated in mammalian cell cultures in an effort to determine if this environment will elicit a T4 --> T1 transition. Of four avirulent (T4) isolates tested, only one, H4, yielded T1 colonies. This change was consistently obtained in HeLa, WI-38, and MK2 cells, even when the multiplicity of the gonococcal infection was less than 1 per culture. Growth of the gonococci took place primarily on the surface of the cells, as demonstrated by light and electron microscopy, but occasional bacteria were undoubtedly intracellular. T1 colonies were seen at 24 h and were the major population at 48 h. This shift was favored by the presence of viable cells, since smaller yields of T1 were obtained when the cells were irradiated or heat inactivated. It was also favored by low pH, since T1 recovery was reduced when the buffering capacity of the medium was increased. Although the results suggest that T1 gonococci derived from H4 have a selective advantage over T4 in cell cultures, this is not true of all T1 and T4 colony types. F62 T4, which does not undergo a T4 --> T1 shift, propagated as well as T1 in HeLa cell cultures. The change in colony type of strain H4 to T1 was accompanied by formation of pili and by gain in capacity for deoxyribonucleic acid-mediated transformation. It is concluded that gonococci can undergo T4 --> T1 phase transition in mammalian cell cultures, but this property is not retained by all strains.
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532
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Hill JC, Weiss E. Protein fraction with immunogenic potential and low toxicity isolated from the cell wall of Neisseria meningitidis group B. Infect Immun 1974; 10:605-15. [PMID: 4214775 PMCID: PMC422995 DOI: 10.1128/iai.10.3.605-615.1974] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Several fractions were extracted from the cell envelope (CE) of Neisseria meningitidis group B and characterized with regard to their morphology, antigenicity, protein composition, and toxicity. Whole bacterial cells were suspended in a medium of low ionic strength and disrupted in a French pressure cell. The crude CE thus obtained were separated into cell membrane (CM) enriched and cell wall (CW) enriched fractions on sucrose density gradients. In addition, CM and CW fractions were separated from CE on the basis of differential solubility in the nonionic detergent, Triton X-100. The Triton-insoluble fraction, containing primarily CW components, was further treated with a mixture of Triton and ethylenediaminetetraacetic acid, which was shown to remove additional protein and most of the lipopolysaccharide. Electron microscope examination of the various fractions revealed typical unit membrane structures in the case of CM, or large, open segments in the case of CW. The Triton-insoluble and especially the Triton-ethylenediaminetetraacetic acid-insoluble fractions consisted of small vesicular structures. All fractions, except the Triton-soluble fraction, when assayed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, were shown to contain one major protein component accounting for more than 50% of the total. Sera from rabbits immunized with the various fractions formed precipitin lines in immunodiffusion tests against the homologous and some of the heterologous fractions. High-titer bactericidal antibodies were also demonstrated in these sera when tested against the homologous strains. Toxicity studies in rats sensitized with lead acetate indicate that the level of contamination of Triton-insoluble/Triton-ethylenediaminetetraacetic acid-insoluble fractions with lipopolysaccharide was significantly smaller than that of the other fractions.
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533
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Behrens U, Weiss E. Kristall- und molekülstruktur des bis(6,6-dimethylpentafulven)pentacarbonyl-dieisens und des 6,6-diphenylpentafulven-pentacarbonyl-dieisens. J Organomet Chem 1974. [DOI: 10.1016/s0022-328x(00)83847-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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534
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Sterz I, Weiss E. [Origin and phagocytic activity of chicken thrombocytes]. DTW. DEUTSCHE TIERARZTLICHE WOCHENSCHRIFT 1974; 81:311-2. [PMID: 4603723] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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535
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Behrens U, Weiss E. Röntgen-struktur von 6,6-diphenylpentafulven-pentacarbonyl-diruthenium. J Organomet Chem 1974. [DOI: 10.1016/s0022-328x(00)83848-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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536
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Weiss E. Dana, the Geologist. Science 1974; 184:1028. [PMID: 17736176 DOI: 10.1126/science.184.4141.1028-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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537
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538
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Weiss E. Francis B. Gordon, 1905-1973; Mary V. Gordon, 1907-1973. J Infect Dis 1974; 129:230-2. [PMID: 4590006 DOI: 10.1093/infdis/129.2.230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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539
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Weiss E. 1974 Wildlife Disease Association Meeting. J Infect Dis 1974. [DOI: 10.1093/infdis/129.2.232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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540
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Weiss E, Frese K. Tumours of the skin. Bull World Health Organ 1974; 50:79-100. [PMID: 4547652 PMCID: PMC2481222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Tumours occur more frequently in the skin than in any other part of the body. Epithelial tumours are described under the following headings: basal cell tumour, squamous cell carcinoma, papilloma, sebaceous gland tumour, tumour of hepatoid glands, sweat gland tumour, mixed tumour of apocrine sweat glands, carcinoma of apocrine sweat glands, tumour of hair follicle, and intracutaneous cornifying epithelioma. Tumours of the melanogenic system are divided into benign melanoma and malignant melanoma, the latter being subdivided into the following types: epithelioid, spindle cell, epithelioid and spindle cell, dendritic, and whorled.
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541
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Weiss E. Tumours of the soft (mesenchymal) tissues. Bull World Health Organ 1974; 50:101-10. [PMID: 4371740 PMCID: PMC2481224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
This is a classification of tumours of fibrous tissue, fat, muscle, blood and lymph vessels, and mast cells, irrespective of the region of the body in which they arise. Tumours of fibrous tissue are divided into fibroma, fibrosarcoma (including "canine haemangiopericytoma"), other sarcomas, equine sarcoid, and various tumour-like lesions. The histological appearance of the tumours is described and illustrated with photographs.
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542
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Sterz I, Weiss E. Electron microscopical and virological studies of chicken thrombocytes in vitro infected with fowl plague virus (FPV). Med Microbiol Immunol 1974; 159:151-60. [PMID: 4819937 DOI: 10.1007/bf02123728] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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543
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Weiss E, Sterz I, Frimmer M, Kroker R. Electron microscopy of isolated rat hepatocytes before and after treatment with phalloidin. BEITRAGE ZUR PATHOLOGIE 1973; 150:345-56. [PMID: 4361790 DOI: 10.1016/s0005-8165(73)80085-x] [Citation(s) in RCA: 46] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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544
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Weiss E, Teredesai A, Hoffmann R, Hoffmann-Fezer G. Volume distribution and ultrastructure of platelets in acute hog cholera. THROMBOSIS ET DIATHESIS HAEMORRHAGICA 1973; 30:371-80. [PMID: 4773376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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545
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Behrens U, Weiss E. Fulven-eisen-carbonyle. Synthese und Strukturaufklärung von μ{6′,1,2-η:1′,5′-η-[6-dimethylamino-1(fulvenyl-6′),fulven]}-tricarbonyleisendicarbonyleisen(FeFe), (CH32NCHC5H3CHC5H4Fe2(CO)5, ein reaktionsprodukt des 6-dimethylaminofulvens mit dieisenenneacarbonyl. J Organomet Chem 1973. [DOI: 10.1016/s0022-328x(00)95051-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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546
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Sterz I, Weiss E. [Electron microscopy studies on phagocytosis and replication of fowl plague virus in thrombocytes of infected chickens]. ZENTRALBLATT FUR VETERINARMEDIZIN. REIHE B. JOURNAL OF VETERINARY MEDICINE. SERIES B 1973; 20:613-21. [PMID: 4770096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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547
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548
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Weiss E, Green AE, Grays R, Newman LM. Metabolism of Richettsia tsutsugamushi and Rickettsia rickettsi in irradiated host cells. Infect Immun 1973; 8:4-7. [PMID: 4198104 PMCID: PMC422800 DOI: 10.1128/iai.8.1.4-7.1973] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The metabolism of Rickettsia tsutsugamushi (Gilliam strain) multiplying in irradiated L cells was investigated by methods involving the use of (14)C-labeled substrates and cycloheximide, an inhibitor of eukaryotic metabolism. Cycloheximide-resistant amino acid and adenine incorporations were appreciably higher in infected than in uninfected cultures during the period from 3 to 5 or 6 days postinoculation. The metabolism of R. rickettsi was similarly studied in primary duck embryo cells, which are more susceptible to infection with this rickettsia than are L cells. A difference in cycloheximide-resistant activity between infected and uninfected cultures was also noted, but was small. This finding is attributed to the more limited growth of R. rickettsi.
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549
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Abstract
There is a small but distinct difference in DNA base composition between the typhus and spotted fever groups of rickettsiae. The molar percentages of guanine plus cytosine for Rickettsia prowazeki, R. typhi, and R. canada are approximately 30, for R. rickettsi, R. conori, and R. akari they are about 32.5. The percentage for trench fever rickettsia, Rochalimaea quintana, is 38.6.
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550
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Sawlewicz L, Weiss E, Linde HH, Meyer K. [245. 3-Alpha- and 3-beta-amino-3-deoxydigitoxigenin. Partial synthesis experiments in the series of heart poisons. 5]. Helv Chim Acta 1972; 55:2452-60. [PMID: 4637274 DOI: 10.1002/hlca.19720550722] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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