Al3+ in combination with kinetin showed more protection against degradation of chlorophyll (Chl) and protein than Al3+ or kinetin alone during dark-induced senescence in wheat primary leaf segments. MV-dependent whole chain electron transport, photosystem (PS) 2 mediated oxygen evolution, and PS1 activities were also delayed to a greater extent. Absorbed excitation energy distribution was more in favour of PS1 in Al3+ plus kinetin-treated leaf thylakoids at 72 h. and D. Subhan, S. D. S. Murthy.
Changes in the activity of ribulose 1,5-bisphosphate carboxylase (RuBPC), soluble proteins and l‘*C02 fixation were studied in Vigna sinen.sis L. seedlings grovvn under nonnal and ultraviolet-B (UV-B) enhanced radiations at 10, 20, 30 and 40 ^C. The seedlings grown under nonnal radiation showed a progressive increase in enzyme activity, soluble protein and *‘*C02 fixation with an increase in temperature from 20 to 40 oC, while seedlings grown under UV-B enhanced radiation showed gradual decrease in these parameters with a maximum effect at 20-30 oC, At 40 oC, the inhibition was less. RuBPC activity, soluble protein content and '‘♦CO2 fixation showed parallel increases with increasing period of UV-B treatment at 10 oC, The polypeptide pattem of crude leaf extract showed progressive decrease in the level of 55 and 13 kDa polypeptides with the time of UV-B treatment at 20 and 30 °C. However, no such loss in these polypeptides was observed at 10 oC, and at 40 oC only a marginal loss in the level of 13 kDa polypeptide had occuned.
Metalloporphyrins serve important roles in biology and as components in emerging technological assemblies for energy conversion. In this report, we describe the synthesis and characterization of a novel cobalt(II) 5,10,15,20-tetrakis
(3-fluorophenyl)porphyrin bearing a 4-vinylphenyl surface attachment group at a beta position on the macrocycle. Electrochemical measurements show the 3-fluorophenyl groups at the meso positions of the porphyrin perturb the reduction potentials of the complex to more positive values as compared to
non-fluorinated analogs, thus allowing access to reduced cobalt porphyrin species at significantly less negative applied bias potentials. The complex, cobalt(II) 5,10,15,20-tetrakis(3-fluorophenyl)-2-(4-vinylphenyl)porphyrin, is abbreviated in this article as Gov-1 in honor of Govindjee for his pioneering investigations in the role of fluorine as a promoter of novel
protein-substrate interactions and the inspirational role he continues to have in encouraging young investigators in the areas of natural and artificial photosynthesis., D. Khusnutdinova, M. Flores, A. M. Beiler, G. F. Moore., and Obsahuje bibliografické odkazy
Pea (Pisum sativum) leaves grown under high and low iiradiances were exposed for 6 h to a limiting, saturating oř excessive irradiance. The tůně courses of synthesis of the photosystem 2 (PS 2) core proteins D2 and CP43 and CP47 were studied. The D2 protein synthesis characteristics were shown to be dependent on both the growth irradiance and the irradiance during synthesis, reflecáng long-term and short-term adjustments of the plant. CP43 and CP47 synthesis was less susceptible to alterations in irradiance.
This article examines the evolution of the term tabula from antiquity onward and the use of it in middle ages and early modern age literature. It analyses in detail the term tabulae ecclesiae finding its triple meaning in the Central European environment: 1) tabulae written on parchment (later on paper) and fixed on a board in the church – these contained information and instructions for laymen, those in the sacristy or in the choir contained normative constitutions or doctrinal auctoritates for clerics, 2) tabulae on the church walls near the high-altar contained lists of persons to be remembered in liturgy permanently; their external form were frescos framing their names like funeral tablets, 3) the same term tabulae ecclesiae is used also in the sense of financial cash resulting from a church collection. In all cases the ideological connection of medieval church boards to antique legistic texts (1.), to fasti (2.) or to the external form of a real board only (3.) is examined.
This article examines the evolution of the term tabula from antiquity onward and the use of it in middle ages and early modern age literature. It analyses in detail the term tabulae ecclesiae finding its triple meaning in the Central European environment: 1) tabulae written on parchment (later on paper) and fixed on a board in the church – these contained information and instructions for laymen, those in the sacristy or in the choir contained normative constitutions or doctrinal auctoritates for clerics, 2) tabulae on the church walls near the high-altar contained lists of persons to be remembered in liturgy permanently; their external form were frescos framing their names like funeral tablets, 3) the same term tabulae ecclesiae is used also in the sense of financial cash resulting from a church collection. In all cases the ideological connection of medieval church boards to antique legistic texts (1.), to fasti (2.) or to the external form of a real board only (3.) is examined.
This article examines the evolution of the term tabula from antiquity onward and the use of it in middle ages and early modern age literature. It analyses in detail the term tabulae ecclesiae finding its triple meaning in the Central European environment: 1) tabulae written on parchment (later on paper) and fixed on a board in the church – these contained information and instructions for laymen, those in the sacristy or in the choir contained normative constitutions or doctrinal auctoritates for clerics, 2) tabulae on the church walls near the high-altar contained lists of persons to be remembered in liturgy permanently; their external form were frescos framing their names like funeral tablets, 3) the same term tabulae ecclesiae is used also in the sense of financial cash resulting from a church collection. In all cases the ideological connection of medieval church boards to antique legistic texts (1.), to fasti (2.) or to the external form of a real board only (3.) is examined.
We studied the responses of gas exchange, leaf morphology, and growth to irradiance in Taihangia rupestris, a naturally rare herb inhabiting only vertical cliff faces. In low irradiance (LI, 10 % of full sun) T. rupestris had lower net photosynthetic rate (PN) and produced much less leaves, total leaf area, and biomass than in high (HI, full sun) or medium irradiance (MI, 50 % of full sun). PN of T. rupestris was higher in HI than in MI on August 8, but lower in HI than in MI on September 22. T. rupestris had shorter petioles and lower leaf area ratio, and produced more but smaller and thicker leaves in HI than in MI. In HI the fast production of new leaves may guarantee T. rupestris to maintain higher PN at the whole plant level and thus accumulate more biomass at harvest, although the single-leaf PN may become lower as found on September 22. Hence T. rupestris possesses a latent capacity to acclimate and adapt to full sun. Irradiance, therefore, may not be a responsible factor for the restricted distribution of T. rupestris on vertical cliffs. and Min Tang ... [et al.].