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Institute
- Biowissenschaften (1133) (remove)
In haploid and diploid S. cerevisiae the dimer yield ratio TT̂/CT̂ is found to be 1.2/1 and 1.3/1, resp., at the UV (254 nm) unit dose 1 erg/mm2, the share of TT̂ and CT̂ in a UV (254 nm) lethal hit being 0.7 TT̂ and 0.6 CT̂. A general formulation of the UV lethal hit is given and discussed. The TT̂ + CT̂ yields obtained for S. cerevisiae are compared to those reported for other organisms. It is found that there obviously exists a directly proportional linear correlation between genome size and TT̂ + CT̂ yield for the UV dose range well below the stationary levels of the TT̂ and CT̂ formation kinetics.
Testosterone, Androst-4-en-3,17-dione, Enzyme Induction, S trep to m yces hydrogenans After cultivation of S trep to m yces hydrogenan s in the presence of 3H-labelled testosterone, radio active steroids were extracted separately from the cytosolic, ribosomal and cell wall-membrane fraction of the cells and from the culture medium, respectively.. The separation of the steroids was performed by one-and two-dimensional thin layer chromatography (TLC). The identification of the main metabolites was achieved by crystallization to constant specific radioactivity, specific staining procedures and acetylation. The oxidation of testosterone to androst-4-en-3,17-dione is by far the predominating reaction, which is almost finished after 3 h cultivation. Androst-4-en-3,17-dione is mainly transferred into the culture medium and partly accumulated within the cell wall-membrane fraction. High polar steroid metabolites and androstane derivatives are present in very small amounts only.
Resting potato tuber tissue possesses only faint activity of the two dehydrogenases of the oxidative pentose phosphate cycle, glucose-6-phosphate- and 6-phosphogluconate dehydrogenase. Slicing of the tissue, however, greatly enhances the action of both enzymes. The slicing-induced increase in activity is a consequence of intensified action of at least 5 glucose-6-phosphate dehydrogenase isozymes and a more differentiated activation/inactivation of seven 6-phosphogluconate dehydrogenase isozymes.
Using density labelling and isopycnic equilibrium centrifugation it could be demonstrated, that the bulk of both enzymes appearing after slicing the tissue is the result of de novo synthesis rather than activation of pre-existing proenzymes.
An improved method for isolation of yeast m utants auxotrophic for 5′-dTM P is presented. The procedure employs the two folic acid antagonists am inopterin and sulfanilam ide (SAA). Selectiveness of the procedure depends on concentration of SAA and time of incubation.
44 mutants auxotrophic and 3 conditionally auxotrophic for 5′-dTMP were isolated. All belong to one complementation group. The corresponding gene was designated TMP1. Tetrad dissection revealed its chromosomal nature. TMP1 is not closely linked to the genes ADE2,, LEU1, ARG 4, ILV2, HIS5, LYS1 and the mating type locus. With the centromere-linked genes ARG4 and LEU1 I gene TMP1 exhibited second division segregation frequencies of 0.42 and 0.53 respectively, indicative of centromere-linkage.
Strains auxotrophic and conditionally auxotrophic for 5′-dTM P were all respiratory deficient (petite). Genetical analysis indicates that the petite phenotype is due to loss of the rho factor in cells harbouring either tmp1 or tmp1ts alleles.
One of the earliest consequences of slicing plant storage organs such as potato tubers into thin disks is the formation of polysomes, which in potato slices is complete after 9 hours and is dependent on transcription. Fresh disks do not incorporate 32P, 3H-uridine or 14C-leucine into their ribosomes, whereas ribosomes and polysomes of aged disks use these precursors effectively. This development can be completely blocked by actinomycin D. Among the different RNAs synthesized during aging is 28S- and 16S—rRNA, 5S—RNA, tRNA, and a component sedimenting around 15—18S with a base-composition different from 16S—rRNA, 5S- and 4S—RNA and which supports peptide formation in an in vitro incorporation system.
It is suggested that this compound represents mRNA, which is not available immediately after slicing the tissue. These findings are consistent with the view of a derepression phenomenon in sliced storage tissue.
Whereas ribosome preparations of freshly sliced potato disks do not show appreciable activity in an in-vitro amino acid incorporation system, aging of the tissue leads to a greatly enhanced incorporation activity which reaches its maximum 24 hours after slicing. If ribosomes from freshly excised disks are provided with polyuridylic acid, their activity in the incorporation of phenylalanine is increased about 8 fold.
Moreover, an RNA-fraction can be dissociated by EDTA from ribosomes of aged potato tuber slices, which sediments at 15 —18S, has a base composition different from that of 16S — rRNA, 5S-and 4S —RNA, and is not present on ribosomes of fresh slices. Its appearance is inhibited by actinomycin D and therefore most probably dependent on transcription. This compound, purified from sucrose gradients, enhances in vitro leucine incorporation into peptide material by ribosomes of fresh potato slices.
The possibility is discussed that this fraction-among other factors-is responsible for the enhanced protein synthesis after slicing plant storage organs, and is indicative of a general derepression phenomenon in these tissues.
At pH 5.3 and 4.5 the half life of valyl-, threonyl-, leucyl- and seryl-tRNA from E. coli K 12 is significantly higher than at pH 6.8. While no changes were observed in the MAK elution patterns of valyl- and threonyl-tRNA, leucyl-tRNA was eluted in two peaks at pH 6.8 and 5.3 and in one broad peak at pH 4.5. Seryl-TRNA - two peaks at pH 6.8 - was separated in three peaks at pH 5.3 and 4.5. Rechromatography of these peaks at the other pH suggests the existence of at least four species of seryl-tRNA in E. coli K 12.
Fluorescense spectra of lactate dehydrogenase * (E.C. 1.1.1.27) were investigated in the presence of the coenzyme fragments dihydronicotinamide mononucleotide and dihydronicotinamide-ribose-5'-pyrophospho- (P2) -5“-ribose. The reduced mononucleotide is enzymatically less active as a hydrogen donor. However, formation of a complex with the enzyme was not observed under the conditions used. All the other substances: dihydronicotinamide-ribose-5'-pyrophospho- (P2) -5“-ribose, dihydronicotinamide- benzimidazole-dinucleotide, dihydronicotinamide-3-desazapurine-dinucleotide and dihydronicotinamide-6-mercaptopurine-dinucleotide form more or less stable complexes with lactate dehydrogenase. The complexes do not markedly differ from the complex formed with the natural cofactor. In all cases spectra indicate change in conformation of the coenzyme by forming the coenzyme-enzyme-complex which has been proposed by VELICK 1 too. The cysteine residues of the lactate dehydrogenase are not essential for binding the coenzyme to the active center; this was shown with mercury blocked enzyme.
Differential derepression of the genome of potato tuber cells can be initiated by slicing the tissue into disks. The consequence of this procedure on the cells of the wound surface is dedifferentiation and cell division followed by redifferentiation to a suberized phellem cell. The drift of glucose-, glucose-1-phosphate-, glucose-6-phosphate-, fructose-6-phosphate- and 6-phospho-gluconatelevels has been determined in the derepressed tissue. With the exception of 6-phospho-gluconate all intermediates so far investigated showed a rise in concentration after derepression.
This is interpreted as a consequence of altered enzymic activities which were estimated for phosphoglucomutase, hexokinase, phosphoglucoisomerase, gluco-6-phosphate- and 6-phosphogluconatedehydrogenase. The two dehydrogenases were activated after derepression, the activation represented a de-novo-synthesis, as was demonstrated with the inhibitors Actidione (translation) and p-Fluorophenyl-alanine (protein synthesis in general). Hexokinase and phosphoglucoisomerase were not severely affected by cutting the tissue. Phosphoglucomutase was degrated rapidly, the degradation being dependent on protein synthesis. The importance of an enhanced activity of the pentose phosphate shunt for the stressed cell is emphasized and the possibility of an alteration in the osmotic pressure within the cell and especially in the nucleus — a primary consequence of wounding — as a cause of derepression in potato tuber cells is discussed.
Wirtszellreaktivierung chemisch induzierter Letalschäden im DNS-haltigen Serratia-Phagen Kappa
(1965)
After treating free phage Kappa with nitrous acid, triethylenemelamine, ethylmethanesulfonate, or hydroxylamin and using these phages for infecting Serratia H Y wildtype cells, at least 20% of the lethal damage in the phage-DNA can be reactivated by the host ( = host cell reactivation). It is known that all lethal agents tested so far attack the primary structure of the D N A in different ways. Therefore, we assume that the target for the host cell reactivation consists of some damage in the secondary structure of the DNA, because there is probably some coincidence in the action of all agents. The hypothesis that in the DNA changes of thymine are a prerequisite for host cell reactivation has been disproved by the experiments with nitrous acid and ethylmethanesulfonate because both substances do not act on thymine.
Die kontinuierliche Messung des CO2-Gaswechsels homogener Sedimente einzelliger Grünalgen hat ergeben, daß das Kohlendioxyd während der ersten Belichtungsphase zunächst an einen primären, in den verdunkelten Zellen bereits vorhandenen CO2-Acceptor (AI) angelagert wird. AI ist nur im Licht zur Aufnahme und lockeren Bindung von Kohlendioxyd befähigt und gibt die während kurzer Lichtperioden (4-30 sec) aufgenommene CO2-Menge in der anschließenden Dunkelperiode sehr schnell wieder ab. Im Verlauf längerer Belichtungszeiten (> 30 sec) übergibt AI das locker gebundene Kohlendioxyd an den inzwischen in zunehmender Konzentration gebildeten CO2-Acceptor des Calvin - Zyklus (Ribulosediphosphat = AII). Die mit der Aufnahme und lockeren Bindung von Kohlendioxyd an den aktivierten Acceptor AI und der CO2-Weitergabe an AII zusammenhängenden Übergangserscheinungen werden eingehend diskutiert.
UV inactivated KAPPA can be reactivated like other temperate phages by plating on uvirradiated host cells (indicator). The capacity of the indicator Serratia HY for multiplication of unirradiated KAPPA was about 0.1% survivors (colony formers). The induction of clear plaque (c·) mutants by irradiating extracellular KAPPA and plating on untreated indicator can be increased further about 2 to 4 times by using UV irradiated indicator. The increase of the number of c mutants under the latter conditions, with increasing UV dose given to the phage, was never a firstorder reaction. The highest frequency of c mutants obtained was about 4.5 per cent. Plating of unirradiated KAPPA on irradiated indicator (lowest survival fraction was 0.01%) never increased the spontaneous mutation rate to c. Two c mutants studied in detail belong to two different cistrons as shown in a complementation test (map distance about 5.3%). Only one of both was revertible to the phenotype c+ spontaneously and with a higher rate by UV. However, as shown in crossing experiments with the wild type, the backmutants do not have the original genotype but originated from mutations in at least two different intragenic suppressor loci; the map distances between them and the original c mutation were 0.64% and 0.13 per cent. Host range (h) and virulent (v) mutants could not be induced by irradiation of the free phage and plating on untreated indicator. This indicates that the UV induced high mutability of the c loci in KAPPA represents an exceptional case of behavior (UV-hot spot). Some unstable h mutants could be isolated by plating irradiated phage on irradiated indicator.
Die Einwirkung von UV-Strahlen (254 mµ) auf Bakterien und auf DNS führt zur Bildung einer Reihe von Photoprodukten. Thymin bildet ein Thymin-Dimeres und mindestens zwei weitere Photoprodukte. Aus Cytosin entstehen Uracil und ebenfalls mindestens zwei weitere Photoprodukte. Das Thymin-Dimere läßt sich durch Bestrahlung mit UV-Licht in wäßriger Lösung zu 87% wieder in Thymin zurückverwandeln. Bei den übrigen Photoprodukten gelingt diese Reaktion nicht.
Die durch UV-Strahlen verursachten biologischen Schäden in der Bakterienzelle dürften weitgehend auf die Bildung von dimerem Thymin zurückzuführen sein. Demgegenüber sind die übrigen Photoprodukte, die erst bei höherer UV-Dosis auftreten, nur von untergeordneter biologischer Bedeutung.
Die von der Strahlendosis abhängige Bildung der Thymin-Photoprodukte in Zellen von E. coli wurde quantitativ untersucht.
Eine Denaturierung der nativen DNS durch Erhitzen oder durch Abspalten der Purine zur Apurinsäure hat zur Folge, daß die Bildung des Thymin-Dimeren und eines der übrigen Thymin-Photoprodukte besonders stark begünstigt wird.
Untersuchungen über die Redox-Eigenschaften der Haut nach Bestrahlung mit ultraviolettem Licht
(1959)
Eingehendere Untersuchungen über die mit Hilfe der Nadi - Reaktion nachweisbaren erhöhten Oxydationswirkungen an uv-bestrahlten Hautstellen führten zur Feststellung, daß eine Erhöhung der Peroxydase-Wirkung in Verbindung mit Vermehrung der peroxydischen Eigenschaften als Ursache anzusprechen ist. Aktivierung der Tyrosinase im bestrahlten Gebiet wurde sowohl an der albinotischen Mäusehaut als auch bei Froschschwimmhäuten nachgewiesen. Wellenlängen-Abhängigkeit und Bedeutung als Primäreffekt der UV-Strahlen werden diskutiert.
A method which serves to isolate the gonads from the sea cucumber (Holothuria polii) is outlined. Criteria that will secure a well determined status of maturity of the sperm are given. From this preparation a deoxyribonucleic acid is made, purified and analysed. It is concluded that the analytical data are in compliance with the theory of Crick and Watson. The ratio of Moles for this DNA while its nitrogen to phosphorus ratio on weight basis is 1,67.
Untersuchungen an uv-bestrahlten Schwimmhäuten von Fröschen und Rückenhäuten von Mäusen ergaben, daß mit Hilfe der Nadi - Reaktion (GRÄFF) Oxydationspotentiale an der Bestrahlungsstelle nachgewiesen werden können. Kurzwelliges UV unter λ = 300 mμ hat hierbei die beste Wirkung. Die Stellen stärkster Oxydationskraft liegen bei Schwimmhäuten an den Melanophoren des Corium, bei Mäuserücken-Häuten verteilt im Corium. Bei den Froschhäuten kann zusätzlich bei unphysiologischem pH 4,2 Oxydationswirkung in der Epidermis nachgewiesen werden. Strukturelle Veränderungen an der Schwimmhaut werden polarisationsoptisch deutlich.
Nach Bestrahlung eines kleinen Bezirkes der Froschschwimmhaut mit verschiedenen ultravioletten Wellenlängen (λ=254 mµ, 280 mµ, 297 mµ, 313 mµ, 366 mµ) wurde Stase in den Kapillaren beobachtet. Die Wirksamkeit der verschiedenen Wellenlängen ist dabei unterschiedlich. Messungen der Durchlässigkeit der Schwimmhaut wurden durchgeführt und erlaubten Schlüsse auf die in das Kapillargebiet hingelangende Strahlung. Während der Bestrahlungen konnten Durchlässigkeits-Veränderungen der Schwimmhaut beobachtet und gemessen werden. Die Ergebnisse werden diskutiert. Histologische Untersuchungen erweiterten das Bild über die Veränderungen im Gewebe durch Strahleneinwirkung.
Gedanken und Versuche zum ernsthaften Einsatz des wissenschaftlichen Films im Hochschulunterricht
(1956)
1. Die Lebensdauer und Entwicklungsfähigkeit unbesamter Seeigeleier in Coffeinlösungen (1 : 250 bis 1 : 2000) ist gegenüber der in normalem Seewasser deutlich verlängert.
2. Das Optimum der Lebensverlängerung liegt etwa bei einer Konzentration von 1 : 1000 bis 1 : 1250.
3. Der Zellkern kann sich unter Coffeineinfluß „aufblähen“. und zwar bis zum 3-fachen seines normalen Umfanges.
4. Das Coffein ruft bei gleichbleibender Zellgröße eine Herabsetzung der Viskosität der Zelloberfläche hervor und ermöglicht bei gallertlosen Eiern, die sich berühren, ein Aneinanderlegen und Abplatten der Eier bis zu Reihen-Eiern und Pflasterbildungen. Derartige Eier können sich nach Zurückbringen in Seewasser und Besamung noch am 4. und 5. Tage zu Plutei aller Normalitäts-Stufen entwickeln.
5. Aus den Reiheneiern können durch Verschmelzen braun gefärbte Riesen-Eier hervorgehen, die nicht mehr entwicklungsfähig, aber gegen Zerfall sehr widerstandsfähig sind.
Auf Grund vergleichender Prüfungen im Riesengebirge, im Schwarzwald und im Allgäu zwischen 1250 und 2220 m Meereshöhe wird nachgewiesen, daß die bisher allein bekannt gewordene Beziehung zwischen Lichtfeld und Chlorophyllgehalt der Art, daß der Farbstoffgehalt mit der Lichtintensität bis zur ökologisch maximalen Strahlung ansteigt, nur für die Angehörigen des photostabilen Reaktionstypus gilt.
Neben diesem ist selbst in frei-sonnigen Pflanzenvereinen alpiner Matten und Felsfluren ein photolabiler Typus weit verbreitet, dessen maximal bestrahlte Sonnenblätter im Verlauf des Sommers im Vergleich zu gleich alten Schattenblättern mäßige bis starke Depressionen des (flächenrelativen) Chlorophyllwertes aufweisen.
Der extrem photostabile ist mit dem extrem photolabilen Reaktionstypus durch alle Übergänge verbunden. Allein die Abstufungen der Resistenz können weder auf das Vorleben in bestimmtem Strahlungsklima bzw. bestimmter Höhenlage, noch auf die Zugehörigkeit zu einem bestimmten ökologischen Verbreitungstypus zurückgeführt werden. Photostabile Tieflandpflanzen wie Silene inflata und Anthyllis vulneraria erweisen sich auch in 2220 m Höhe als photostabil, während viele Alpenpflanzen auch in ihrem natürlichen Verbreitungsgebiet ausgesprochen photolabil angetroffen werden.
In synchronen Vergleichsversuchen aus 1415 m Höhe werden an photolabilen Stauden die Zeitkurven der Veränderungen des Chlorophyllwertes beim Übergang aus diffusem Licht in die Gesamtstrahlung und umgekehrt verfolgt. Während im ersten Fall im Verlauf einer Schönwetterperiode die (bisherigen) Scha-Blätter rasch photochemische Chlorophyllzerstörungen erleiden, erfahren die (bisherigen) So-Blätter im diffusen Licht zur gleichen Zeit eine Zunahme des Chlorophylls.
Bestrahlung mit UV und UR einschließlich sichtbaren Lichts bedingt bei weißen Mäusen und Hühnern eine Senkung im Gasstoffwechsel von durchschnittlich 25% und im Dauerversuch eine deutliche Herabsetzung des Grundstoffwechsels, während Lichtmangel bei weißen Mäusen den Stoffwechsel erhöht.
Sichtbares Licht, UV oder UR allein bewirken keinen Stoffwechselabfall.
Für die Stoffwechselerniedrigung nach Bestrahlung ist eine bestimmte Kombination von UV und UR notwendig.
Die Wirkung der Bestrahlung beruht mit großer Wahrscheinlichkeit auf einer Senkung des Tonus des Sympathicus und einer Verschiebung der vegetativen Regulationslage zur Vagotonie.
Eigenbestrahlungsversuche (G.) zeigten eine gleiche Senkung des durch Hyperthyreose erhöhten Grundstoffwechsels.
Es wird die Brauchbarkeit der Wärmeleitfähigkeitsmessung zur Ermittlung des Grundumsatzes geprüft.
Durch Diffusion des Meßgases zu den Hitzdrähten, eine Anordnung, die in der industriellen Meßtechnik häufig Anwendung findet, wird erreicht, daß die Messung weitgehend von der linearen Strömungsgeschwindigkeit unabhängig wird. Die Empfindlichkeit der Sauerstoffbestimmung wird gesteigert durch Erhöhung der Hitzdrahttemperatur. Eine Anordnung zur Bestimmung des Grundumsatzes am Menschen wird beschrieben, die es gestattet, im „offenen System" laufende Messungen durchzuführen. Die laufende Messung“ wird den integrierenden Methoden gegenübergestellt.