| | 21 | Author
| M. Ciscato3 ', J. Vangronsveldb, R. Valcke3 | Requires cookie* | | | Title
| Effects of Heavy Metals on the Fast Chlorophyll Fluorescence Induction Kinetics of Photosystem II: a Comparative Study  | | | | Abstract
| The effects of toxic concentrations of Cu, Zn and Cd on the fast induction kinetics of fluorescence from photosystem(PS)II were investigated in a comparative way. The fast fluo rescence transient from primary leaves of m etal-treated bean plants was studied. During several days after metal application, the time course of the changes induced by the different metals was monitored. The results evidenced not only a different time course of the changes in fluorescence related parameters for the three metals, but also different effects on the fluorescence induction kinetics, which could possibly be linked to different mechanisms of action of the metals. | | | |
Reference
| Z. Naturforsch. 54c, 735 (1999); received November 8 1998/M arch 10 1999 | | | |
Published
| 1999 | | | |
Keywords
| Cadmium, Chlorophyll Fluorescence, Copper, Heavy Metals, Zinc | | | |
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| default:Reihe_C/54/ZNC-1999-54c-0735.pdf | | | | Identifier
| ZNC-1999-54c-0735 | | | | Volume
| 54 | |
| 22 | Author
| É. Va Sárvári3, Ferenc Fodor3, Edit Cseh3, Anita Vargab, GyulaZ. Árayb, Lello Zollac | Requires cookie* | | | Title
| Relationship between Changes in Ion Content of Leaves and Chlorophyll-Protein Composition in Cucumber under Cd and Pb Stress | | | | Abstract
| Hydroponically cultured cucumber plants supplied with 4 |.im Fe chelated either with E D T A or citrate and treated with Cd (10 jim) and Pb (10, 50 jam) from their one-or four-leaf stage were grown up to five-week-old age. The decrease in the chlorophyll content was the most pronounced in plants treated with Cd from a younger age, and in the case of Fe-citrate. The chlorophyll a/b ratio of Cd stressed plants was also significantly lowered. In later treated plants the accumulation of chlorophyll was inhibited and the chlorophyll a/b ratio decreased only in the vigorously growing young leaves. Pb treatm ent had only a slight effect on both parameters. The changes in the chlorophyll-protein pattern of thylakoids were strongly related to their chlorophyll content but the response of each complex was different. Cd reduced the amount of chlorophyll containing complexes in the order of photosystem I > light-harvesting complex II > photosystem Il-core, while light-harvesting complex II ap peared somewhat more sensitive than photosystem I in Pb treated plants. In accordance, a decline or blue shift of the long wavelength fluorescence emission band of chloroplasts was observed referring to disturbances also in photosystem I antenna assembly. The accumulation of chlorophyll and chlorophyll-proteins did not show close relationship to the heavy metal content of leaves which was the highest in the first of the intensively expanding leaves in the time of the treatm ent. The extraordinary sensitivity of photosystem I, and the relative sta bility of photosystem II under Cd treatm ent were similar to the case found in iron deficient plants. However, the pattern of chlorophyll content of leaf storeys of Cd treated plants rather followed the changes in their Mn content. | | | |
Reference
| Z. Naturforsch. 54c, 746 (1999); received November 15 1998/February 18 1999 | | | |
Published
| 1999 | | | |
Keywords
| Cadmium, Chlorophyll-protein complexes, Fluorescence emission Heavy metal stress, Lead | | | |
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| default:Reihe_C/54/ZNC-1999-54c-0746.pdf | | | | Identifier
| ZNC-1999-54c-0746 | | | | Volume
| 54 | |
| 23 | Author
| Zoltán Takács, Zsolt Csintalan, Zoltán Tuba | Requires cookie* | | | Title
| Responses of the Lichen Cladonia convoluta to High C 0 2 Level and Heavy Metal Treatment | | | | Abstract
| Despite of the downward acclimation of photosynthesis in C. convoluta, increased net photosynthesis and carbon balance can be anticipated in response to elevated atmospheric C 0 2 level. C 0 2 exchange measurement seems to be m ore indicative when detecting heavy metal stress than fluorescence parameters. Among these, the relative fluorescence decrease ratio (R F d 690) shows damage first, suggesting that the primary attack site for heavy metal ions is C 0 2 fixation and reaction centres are harmed last. Long-term elevated C 0 2 amelio rates partly this damage by improving C-balance to a greater extent in the heavy-metal stressed lichens. | | | |
Reference
| Z. Naturforsch. 54c, 797—8 (1999); received November 15 1998/M arch 5 1999 | | | |
Published
| 1999 | | | |
Keywords
| Cadmium, Lead, Fluorescence, Respiration, Photosystem II | | | |
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| default:Reihe_C/54/ZNC-1999-54c-0797.pdf | | | | Identifier
| ZNC-1999-54c-0797 | | | | Volume
| 54 | |
| 24 | Author
| | Requires cookie* | | | Title
| | | | | Abstract
| AB2 X 2 Compounds with the CaAl2Si2 Structure, I I 1 (A = C a; B = Zn, Cd; X = P, As) P e t e r K l ü f e r s u n d A l b r e c h t M e w i s In stitu t Four new ternary calcium compounds of zinc (cadmium) with a 5 B-element have been prepared. Analytic, pycnometric and X-ray powder data are given. The compounds are supposed to crystallize trigonally in a CaAl2 Si2-type structure. | | | |
Reference
| (Z. Naturforsch. 32b, 353—354 [1977]; eingegangen am 3. Dezember 1976) | | | |
Published
| 1977 | | | |
Keywords
| Calcium Compounds, Zinc, Cadmium, 5 B-elements, Crystal Data | | | |
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| default:Reihe_B/32/ZNB-1977-32b-0353_n.pdf | | | | Identifier
| ZNB-1977-32b-0353_n | | | | Volume
| 32 | |
| 25 | Author
| Reinhard Matthes, Hans-Uwe Schuster | Requires cookie* | | | Title
| Synthese und Struktur der Phasen K2CdSn und K2CdPb Synthesis and Structure of the Phase K2CdSn and K2CdPb | | | | Abstract
| orthorhombically, with space group Ama2 = Cmc2, a = 645.8 pm, b = 860.2 pm, c — 1095.5 pm. The structure is built of a potassium-3D-net forming eight-edged channels parallel to the a-axis; these channels are penetrated by infinite Cd-Pb-zigzag-chains. The powder-diagram shows the homologous phase K2CdSn (a = 643.2 pm, b = 854.3 pm, c = 1087.7 pm) to be isotypic to K2CdPb. | | | |
Reference
| Z. Naturforsch. 34b, 541—543 (1979); eingegangen am 28. Dezember 1978 | | | |
Published
| 1979 | | | |
Keywords
| Ternary Phases, Potassium, Cadmium, 4B-Element, Crystal Data K2CdPb crystallizes | | | |
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| default:Reihe_B/34/ZNB-1979-34b-0541.pdf | | | | Identifier
| ZNB-1979-34b-0541 | | | | Volume
| 34 | |
| 26 | Author
| Reinhard Matthes, Hans-Uwe Schuster | Requires cookie* | | | Title
| Ternäre Natriumphasen mit Cadmium bzw. Quecksilber und Zinn bzw. Blei Ternary Sodium Phases with Cadmium or Mercury and Tin or Lead | | | | Abstract
| Four ternary sodium phases with the formula Na2BX (B = Cd, Hg; X = Sn, Pb) were prepared and structurally investigated. The structures of the cubic phases Na2HgSn, Na2CdPb and Na2HgPb (space group F43m) are closely related to LiaBi, that of Na2CdSn (space group P63mmc) to the hexagonal structure of NaßAs. | | | |
Reference
| Z. Naturforsch. 35b, 778—780 (1980); eingegangen am 8. Februar 1980 | | | |
Published
| 1980 | | | |
Keywords
| Ternary Intermetallic Phases, Sodium, Cadmium, Mercury, Tin, Lead, Crystal Structures | | | |
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| default:Reihe_B/35/ZNB-1980-35b-0778_n.pdf | | | | Identifier
| ZNB-1980-35b-0778_n | | | | Volume
| 35 | |
| 27 | Author
| Jörg Adel, Frank Weller, Kurt Dehnicke | Requires cookie* | | | Title
| Synthese und Kristallstrukturen der spirocyclischen Polyselenido-Komplexe [Na-15-Krone-5] 2 [M(Se 4 ) 2 ] mit M = Zink, Cadmium und Quecksilber Sythesis and Crystal Structures of the Spirocyclic Polyselenido Complexes [Na-15-Crown-5] 2 [M(Se 4 ) 2 ] with M = Zink, Cadmium, and Mercury | | | | Abstract
| The title compounds have been prepared by reactions of the metal acetates of zink, cadmium, and mercury with ethanolic solutions of sodium polyselenides in the presence of 15-crown-5. They form dark red crystals, which were characterized by their IR specta as well as by X-ray crystal structure determinations. All complexes [Na-15-crown-5] 2 [M(Se 4) 2 ] with M = Zn (1), Cd (2), Hg (3) crystallize isotypically in the space group C2/c with 4 formula units per unit cell. In the anions [M(Se 4) 2 ] 2 ^ the metal atoms are coordinated tetrahedrally by four selenium atoms of two Se 4 2 ~ units, thus forming a spiro-bicyclus. The complex cations [Na-15-crown-5] + have a Na---Se contact of approximately 299 pm with two selenium atoms of a MSe 4 group, allowing formulation of triple ion species. | | | |
Reference
| Z. Naturforsch. 43b, 1094—1100 (1988); eingegangen am 4. Mai 1988 | | | |
Published
| 1988 | | | |
Keywords
| Polyselenide Complexes of Zink, Cadmium, Mercury, Syntheses, Crystal Structure | | | |
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| default:Reihe_B/43/ZNB-1988-43b-1094.pdf | | | | Identifier
| ZNB-1988-43b-1094 | | | | Volume
| 43 | |
| 28 | Author
| Leto Tziveleka3, Athanassios Kaldis3, Attila Hegedüsb, Judit Kissimonb, Anastasia Prombona3, Gabor Horvathb, Joan Argyroudi-Akoyunoglou3 | Requires cookie* | | | Title
| The Effect of Cd on Chlorophyll and Light-Harvesting Complex II Biosynthesis in Greening Plants | | | | Abstract
| The effect of Cd on chlorophyll (Chi) as well as on light-harvesting complex II (L H C II) accumulation, has been examined during the early stages of development in etiolated Phaseo-lus vulgaris leaves exposed to intermittent light-dark cycles. We found that at the Cd concen trations studied, both Chi and LH C II accumulation were drastically reduced, although the LDS-solubilized total leaf protein level remained unaffected. However, on the basis of total chlorophyll present, the amount of stabilized LH CII was similar in both Cd-treated and non treated samples. Additionally, the thylakoid-bound protease known to degrade L H C II, was found to be inhibited by Cd treatm ent both in vivo and in vitro. Finally, Northern hybridiza tion analysis indicated that Cd affects LH CII accumulation by reducing drastically the steady-state level of L hcb transcripts. | | | |
Reference
| Z. Naturforsch. 54c, 740 (1999); received November 12 1998/April 10 1999 | | | |
Published
| 1999 | | | |
Keywords
| Cadmium, Chlorophyll, Light-Harvesting Complex II, Thylakoid-Bound Protease, Transcription | | | |
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| default:Reihe_C/54/ZNC-1999-54c-0740.pdf | | | | Identifier
| ZNC-1999-54c-0740 | | | | Volume
| 54 | |
| 29 | Author
| Wolfgang Ramm | Requires cookie* | | | Title
| Die Abhängigkeit der Absorption thermischer Neutronen von ihrer Geschwindigkeit | | | | Abstract
| Die Herabsetzung der Dichte thermischer Neutronen in der Umgebung eines Absorbers wurde bei Zimmertemperatur und bei 200 °C bestimmt. Daraus' konnte die Abhängigkeit des Einfangquerschnitts von der Energie im thermischen Gebiet, praktisch unabhängig von der Größe des Streuquerschnitts, gefunden werden. Die Messungen wurden mit Bor, | | | |
Reference
| (Z. Naturforschg. 4a, 245—257 [1949]; eingegangen am 8. Mai 1948) | | | |
Published
| 1949 | | | |
Keywords
| Chlor, Mangan, Eisen, Kobalt, Kupfer, Silber, Cadmium, Samarium, Europium, Gadolinium, Dysprosium und Quecksilber durchgeführt | | | |
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| default:Reihe_A/4/ZNA-1949-4a-0245.pdf | | | | Identifier
| ZNA-1949-4a-0245 | | | | Volume
| 4 | |
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