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  • Articles  (11)
  • Articles: DFG German National Licenses  (11)
  • 1980-1984  (11)
  • Biology  (11)
  • 1
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 21 (1982), S. 1271-1273 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    International journal of immunogenetics 10 (1983), S. 0 
    ISSN: 1744-313X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The growth and reproduction complex contains recessive genes (grc) which influence body weight and gonadal development. Homozygous males are sterile, and they have an arrest of spermatogenesis at the primary spermatocyte stage. Homozygous females are fertile but have a reduced reproductive capacity. The data presented in this paper show that the latter defect is associated with a decrease in the relative number of secondary ovarian follicles and an increase in the number of atretic follicles. This finding indicates that most of the primary follicles do not mature properly. Thus, the genetic defect in gametogenesis controlled by the grc appears to occur at the same stage of development in both females and males.
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 57 (1983), S. 0 
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The contribution of cytochrome and alternative pathways to respiration during soybean [Glycine max (L.) Merr. cv. Chippewa 64] seed formation and maturation was measured by oxygen consumption of embryonic axis and cotyledon tissues and of mitochondria isolated from immature seeds. Respiration rates (dry weight basis) declined duing the last month of seed maturation. Cyanide sensitive respiration (cytochrome pathway) accounted for 80 to 90% of total oxygen consumption throughout seed formation and maturation. The proportion of the total respiration resistant to 1 mM cyanide and inhibited by 1 mM salicylhydroxamic acid (alternative pathway) did not exceed 6%. A residual oxygen consumption, accounting for 5 to 15% of total respiration, persisted in the presence of both inhibitors. Likewise, virtually no alternative respiration was found in mitochondria prepared from immature seeds. The alternative respiratory pathway seems absent during soybean seed formation and maturation regardless of whether grown in the greenhouse or field.
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  • 5
    ISSN: 1615-6110
    Keywords: Lichens ; Rhizocarpon effiguratum ; Rhizocarpon norvegicum ; Rhizocarpon pusillum ; Rhizocarpon superficiale ; Depsides ; depsidones ; pulvinic acid derivatives ; chemotaxonomy ; high performance liquid chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The secondary lichen products of 31 specimens of theRhizocarpon superficiale group are examined by high performance liquid chromatography (HPLC). At 260 nm 13 different compounds have been detected. 6 of them are well-known lichen acids which occur in nearly all the species; but proportions are different and constant for each species. An analytical key is added.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Methods in cell science 8 (1983), S. 141-145 
    ISSN: 1573-0603
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Procedures for preparing 400-liter lots of medium for culturing hybridoma cells are detailed. Modifications to Williams essential basal medium are listed and the effectiveness of the medium for culturing hybridoma cells for antibody production is discussed.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Mycopathologia 73 (1981), S. 29-31 
    ISSN: 1573-0832
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract During a seventeen day period an A. niger fungus ball evolved within a healed tuberculous cavity of a patient. Symptoms were a cough with a chocolate brown expectoration and dyspnea. The patient died and necropsy was performed. Crystals of calcium oxalate were deposited in the cavity lining and in the adjacent tissue of the lung. Fibrosis, mononuclear infiltration and intraalveolar purulent exudate were seen in these tissues. Some small vessels presented recent thrombosis and deposition of calcium oxalate. The bronchus connected with the cavity presented a disrupted epithelial layer, edema, polymorphonuclear infiltration and birefringent crystals. Scattered areas of tubular atrophy, glomerular sclerosis and lymphoid infiltration were seen in the cortex of the kidney. Oxalate crystals were also seen within the renal tubuli.
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  • 8
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Nach Röntgenbestrahlung embryonierterCapillaria hepatica-Eier mit 0.5, 1 bzw. 2 Krd war bei den aus den Eilarven nach Infektion vonMastomys natalensis hervorgegangenen weiblichen Nematoden die Eiproduktion zunehmend reduziert. Sie unterblieb nach Bestrahlung mit 3, 4, 5, 10, 30, 50 bzw. 70 Krd. Die Leberinvasionsfähigkeit der Parasiten war nicht beeinträchtigt. Die Infektion vonM. natalensis mit unbestrahlten embryonierten Eiern führte bereits zwischen dem 6. und 8. Tag p.i. zu einem Anstieg der Serum-GLDH-Aktivitäten. Er erreichte in dieser Phase der Infektion die Höchstwerte. Hohe Werte wurden auch nach Beginn der Patenz festgestellt. Die erhöhte Aktivität hielt bis zum Versuchsende am 36. Tag p.i. an. Nach Infektion mit 2,2 bzw. 5 Krd bestrahlten Eiern waren die Aktivitätserhöhungen geringer und traten im Verlauf der Infektion mit 5 Krd bestrahlten Eiern auch verzögert auf. Nach Infektion mit unbestrahlten Eiern ließen sich im indirekten Hämagglutinationstest mit wässrigem Antigenextrakt aus nicht embryonierten Eiern die ersten Antikörper bereits 1 Woche p.i. nachweisen. Die Höchsttiter traten mit Beginn der Patenz auf. Nach anschließendem fast plateauartigem Verlauf setzte etwa mit Beendigung der Eiproduktion ungefähr um die 7. Woche p.i. ein kontinuierlicher Titerabfall ein. Der Antikörpernachweis gelang jedoch bis zum Versuchsende 17 Wochen p.i. — Nach Infektionen mit 2,2 bzw. 5 Krd bestrahlten Eiern gelang der Antikörpernachweis erst später. Die erreichten Höchsttiter waren geringfügig (2,2 Krd) bzw. auffällig (5 Krd) niedriger. Der anschließende Titerabfall führte zur Annäherung an die Werte nicht infizierterM. natalensis. Die Ergebnisse werden vergleichend mit an anderer Stelle mitgeteilten Befunden zur Leberpathohistologie der Capillariasis diskutiert.
    Notes: Abstract X-ray irradiation of embryonatedCapillaria hepatica eggs using 0.5, 1, or 2 Krd resulted in a progressive decrease of egg production of the female nematodes which had developed from irradiated first stage larvae inMastomys natalensis. Egg production did not occur after irradiation with 3, 4, 5, 10, 30, 50, or 70 Krd. The capacity of the parasites to invade the liver was not influenced. Infection ofM. natalensis using unirradiated eggs was followed by an increase of serum-GLDH-activities between days 6 and 8 post infection reaching maximum values in this period of infection. Furthermore high values have been determined after the beginning of patency. Increased activity persisted up to the end of the experiment on day 36 post infection. After infection with eggs which had received 2.2 or 5 Krd the increase of serum-GLDH-activities was decreased and occurred later in the course of infection using 5 Krd irradiated eggs. Antibodies could be demonstrated as early as one week after infection with unirradiated eggs. Employing the indirect haemagglutination test, using an aqueous extract from non-embryonated eggs as antigen, maximum titres occurred at the beginning of patency. After a nearly plateau-like course titres began to drop about 7 weeks p.i., i.e. about the end of egg production by the female worms, but antibodies were still detectable 17 weeks p.i. (end of the observation period). After infection with eggs which had received 2.2 or 5 Krd antibody development was delayed. Maximum titres were some-what (2.2 Krd) or markedly (5 Krd) lower. Thereafter titres dropped to values comparable to those of uninfectedM. natalensis. The results are compared with published reports on the pathohistology of capillariasis.
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  • 9
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The results presented deal with the humoral immune response of golden hamsters to primary experimental infection withD. dendriticum. The development of serum antibodies has been comparatively investigated with three hamster groups (n=43) harbouring different burdens of adult flukes. The mean numbers of parasites were 11, 30, or 130 per animal. Serum antibody response was studied during an observation period of at least 331 and up to 496 days postinfection. For antibody detection the sensitivities of precipitation tests (PTs) (double diffusion test, immuno- and counterimmunoelectrophoresis), of the indirect haemagglutination test (IHAT), the complement fixation test (CFT), and the enzyme linked immuno sorbent assay (ELISA) were compared using aqueous crude fluke antigen and crude egg antigen. CFT and ELISA were most sensitive for the early detection of initial response. Thereafter all the tests employed revealed increasing antibody titres, which in general remained at constant levels and persisted until the end of the observation period with the exception of CF-antibodies. In general fluke antigen was found to be more sensitive than egg antigen. However, in CFT this antigen occasionally has been associated with unspecific inhibition of haemolysis. Comparison of the results shows that ELISA using crude fluke antigen gave the most realistic picture of the actual fluke burden. Also preliminary results on the precipitin response of rabbits (n=3) after primary experimental exposure to different numbers of metacercariae (500, 1,000, and 3,000 per animal respectively) are reported. Employing the above mentioned PTs a persisting antibody response could be demonstrated only after exposure to at least 3,000 infective larvae. The initial response was found on day 63, the observation period was 550 days.
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  • 10
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Crude aqueousLitomosoides carinii adult worm extract was used as antigen for the detection of antibodies in sera from African patients with proven onchocerciasis (n=45) resident in rural endemic areas of Togo and Sierra Leone. In 71% of cases this extract was found to produce 1 to 5 precipitation arcs in immunoelectrophoresis. Using a crude aqueous extract from adultOnchocerca volvulus, precipitation tests were positive in 75% of cases. The complexity of theL. carinii curde extract was shown by PAG-disc electrophoresis, PAG-electrofocusing, immunoelectrophoresis and crossed immunoelectrophoresis with the appropriate rabbit-antiserum. An antigen detecting onchocercal antibodies was isolated by two step preparative flat bed electrofocusing in granulated gel (PEGG). The antigen (pI 6.55, molecular weight 55 to 60 kd as estimated by SDS-PAG electrophoresis) was very suitable for antibody demonstration in double diffusion test and immunoelectrophoresis. Preliminary controls for specificity were performed by diffusing the antigen against sera from human and animal helminthoses including filarial infections. In contrast to the crudeL. carinii extract no reaction was observed with sera from helminthic infections others than filariasis.
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