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Klaus Lorentz 《Histochemistry and cell biology》1960,2(2):136-142
Zusammenfassung In der vorliegenden Arbeit wird untersucht, in welcher Weise chemische Gruppierungen der Grund- und Kittsubstanz die Azanfärbung des lamellären Knochens beeinflussen.Es wurde dabei gezeigt, daß für die Aufnahme von Azokarmin Amino- und Iminogruppen große Bedeutung besitzen. Ihre Zerstörung führt zum Verlust der Azokarminfärbung bei 18° C undph 5,82. Mit heißen Lösungen dieses Farbstoffes vonph 2,58 hingegen (Azokarminbad bei der Azanfärbung) ist noch eine Anfärbung des Knochens herbeizuführen. Sie gelingt auch mit der erstgenannten Lösung nach Einwirkung verdünnter Säuren bei 60° C. Die Aufnahme von Azokarmin bei der Azanmethode wird daher auf eine Veränderung derKittsubstanz des Knochens durch das heiße Färbebad bezogen.Anilinblau wird ebenfalls von den Aminogruppen des Gewebes gebunden, es kann jedoch auch durch seine basischen Phenylaminogruppen eine Bindung mit sauren Gruppen des Substrats eingehen. Die Anwendung von Phosphorwolframsäure macht dem Anilinblau außerdem vermehrt basische Gruppen zugänglich. Eine vorhergehende Azokarminfärbung erlaubt daher oft noch eine Aufnahme von Anilinblau durch den Knochen. Am kollagenen Bindegewebe findet wegen der geringen Anzahl der Aminogruppen keine Hemmung durch Azokarmin statt.Mit 1 Textabbildung 相似文献
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Nielsen J; Peixoto AA; Piccin A; Costa R; Kyriacou CP; Chalmers D 《Molecular biology and evolution》1994,11(6):839-853
The region of the clock gene period (per) that encodes a repetitive tract
of threonine-glycine (Thr-Gly) pairs has been compared between Dipteran
species both within and outside the Drosophilidae. All the non-
Drosophilidae sequences in this region are short and present a remarkably
stable picture compared to the Drosophilidae, in which the region is much
larger and extremely variable, both in size and composition. The
accelerated evolution in the repetitive region of the Drosophilidae appears
to be mainly due to an expansion of two ancestral repeats, one encoding a
Thr-Gly dipeptide and the other a pentapeptide rich in serine, glycine, and
asparagine or threonine. In some drosophilids the expansion involves a
duplication of the pentapeptide sequence, but in Drosophila pseudoobscura
both the dipeptide and the pentapeptide repeats are present in larger
numbers. In the nondrosophilids, however, the pentapeptide sequence is
represented by one copy and the dipeptide by two copies. These observations
fulfill some of the predictions of recent theoretical models that have
simulated the evolution of repetitive sequences.
相似文献
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Summary The products of 11 switching (swi) genes are required for efficient mating-type (MT) switching in homothallic (h
90) strains of Schizosaccharomyces pombe. The MT region of h
90 comprises three cassette genes: the expression site mat1: 1 and two silent loci, mat2: 2 and mat3: 3. Besides reducing MT switching, the swi6 mutation leads to deletions in the MT region caused by intrachromosomal cross-overs between two paired cassettes. These deletions only arise if DNA double-strand breaks are present at mat1: 1, which initiate MT switching. Furthermore, swi6 allows meiotic recombination in the K region, a region of 16 kb between mat2: 2 and mat3: 3; in wild-type strains no recombination occurs in K. swi6 also allows the simultaneous expression of two different cassettes in the same haploid cell. Thus swi6 may have an influence on the general chromatin structure in the MT region. 相似文献
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Bror Edlund Jill Andersson Vincent Titanji Ulla Dahlqvist Pia Ekman Örjan Zetterqvist Lorentz Engström 《Biochemical and biophysical research communications》1975,67(4):1516-1521
One dominating peptic phosphopeptide, Asx-Thr-Lys-Gly-Pro-Glx-Ile-Glx-Thr-Gly-Val-Leu-Arg-Arg-Ala-(32P)SerP-Val-Ala-Glx-Leu, was obtained from rat liver pyruvate kinase (type L) phosphorylated by cyclic 3′,5′-AMP-stimulated protein kinase from the same tissue. The sequence around the phosphorylated serine residue is similar to that of a corresponding but smaller peptic phosphopeptide previously isolated from pig liver (type L) pyruvate kinase, Leu-Arg-Arg-Ala-(32P)SerP-Leu. 相似文献
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This study aimed to measure changes in socioeconomic inequalities in smoking and smoking cessation due to the 2006 smoking ban in Luxembourg. Data were derived from the PSELL3/EU-SILC (Panel Socio-Economique Liewen Zu Letzebuerg/European Union—Statistic on Income and Living Conditions) survey, which was a representative survey of the general population aged ≥16 years conducted in Luxembourg in 2005, 2007, and 2008. Smoking prevalence and smoking cessation due to the 2006 smoking ban were used as the main smoking outcomes. Two inequality measures were calculated to assess the magnitude and temporal trends of socioeconomic inequalities in smoking: the prevalence ratio and the disparity index. Smoking cessation due to the smoking ban was considered as a positive outcome. Three multiple logistic regression models were used to assess social inequalities in smoking cessation due to the 2006 smoking ban. Education level, income, and employment status served as proxies for socioeconomic status. The prevalence of smoking decreased by 22.5% between 2005 and 2008 (from 23.1% in 2005 to 17.9% in 2008), but socioeconomic inequalities in smoking persisted. Smoking prevalence decreased by 24.2% and 20.2% in men and women, respectively; this difference was not statistically significant. Smoking cessation in daily smokers due to the 2006 smoking ban was associated with education level, employment status, and income, with higher percentages of quitters among those with a lower socioeconomic status. The decrease in smoking prevalence after the 2006 law was also associated with a reduction in socioeconomic inequalities, including differences in education level, income, and employment status. Although the smoking ban contributed to a reduction of such inequalities, they still persist, indicating the need for a more targeted approach of smoke-free policies directed toward lower socioeconomic groups. 相似文献
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