Xylomexicanins A and B, New Δ14,15-Mexicanolides from Seeds of the Chinese Mangrove Xylocarpus granatumZeitschrift fur Naturforschung - Section C Journal of Biosciences - Tập 64 Số 1-2 - Trang 37-42 - 2009
Li‐Ru Shen, Mei Dong, Bao‐Wei Yin, Dong Guo, Manli Zhang, Qing‐Wen Shi, Changhong Huo, Hiromasa Kiyota, Nobuo N. Noda, Bin Cong
Two new mexicanolide-type limonoids, named xylomexicanin A (1) and xylomexicanin B (2), were isolated from seeds of the Chinese mangrove Xylocarpus granatum. Their structures were elucidated on the basis of spectroscopic methods. Compound 1 exhibited antiproliferative activity against human breast carcinoma cells (KT), while 2 did not show inhibitory effects on eleven human tumour cell lin...... hiện toàn bộ
Ảnh hưởng của Ion Lithium đến Nhịp Sinh Học ở Con Người Dịch bởi AI Zeitschrift fur Naturforschung - Section C Journal of Biosciences - Tập 35 Số 5-6 - Trang 503-507 - 1980
Anders Johnsson, Wolfgang Engelmann, Burkhard Pflug, W. Klemke
Tóm tắt
Carbonat lithium kéo dài chu kỳ sinh học của con người trong điều kiện cách ly tạm thời (mùa hè Bắc Cực bốn nhóm).
Bằng chứng gián tiếp cho động học phục hồi rất nhanh của Chlorophyll-aII trong các lạp lục rau chân vịt Dịch bởi AI Zeitschrift fur Naturforschung - Section C Journal of Biosciences - Tập 31 Số 11-12 - Trang 712-721 - 1976
M. Gläser, Ch. Wolff, G. Renger
Abstract
Thay đổi hấp thụ 690 nm phản ánh sự chuyển đổi của chlorophyll trung tâm phản ứng hệ thống II, Chl-aII (thường được gọi là P 680), đã được nghiên cứu dưới các điều kiện thí nghiệm khác nhau trong các lạp lục rau chân vịt. Một so sánh đã được thực hiện với sự phát sinh oxy và với các thay đổi hấp thụ của Chl-aI...... hiện toàn bộ
Two Antinematodal Phenolics from Knema hookeriana, a Sumatran Rainforest PlantZeitschrift fur Naturforschung - Section C Journal of Biosciences - Tập 55 Số 3-4 - Trang 300-304 - 2000
Yohannes Alen, Shûhei Nakajima, Teruhiko Nitoda, Naomichi Baba, Hiroshi Kanzaki, Kazuyoshi Kawazu
Abstract
The activity-guided chromatographic purification of the methanol extract of Knema hookeriana, using pine wood nematodes Bursaphelenchus xylophilus has successfully led to the isolation and characterization of two phenolic antinematodal compounds with minimun effective dose (MED) of 4.5 and 20 μg/cotton ball (μg/ bl.) or 0.018 and 0.073 μᴍ/c...... hiện toàn bộ
Novel Glucoalkaloids from Rauwolfia Cell Cultures – Acetylrauglucine and Related GlucosidesZeitschrift fur Naturforschung - Section C Journal of Biosciences - Tập 43 Số 7-8 - Trang 479-484 - 1988
Carl Michael Ruyter, Helmut Schübel, Joachim Stöckigt
From cell suspension cultures of Rauwolfia serpentina grown in an optimized production medium for the glucoalkaloid raucaffricine, a novel glucoalkaloid was isolated and identified as 17-O-acetyl-21-O-β-ᴅ-glucopyranosyl-ajmaline (acetylrauglucine). This alkaloid is formed in very small amounts (< 5 × 10-4%). The biogenetically related Nα-demethy...... hiện toàn bộ
Conformational Changes Involved in the Switch from Ovalbumin to S-OvalbuminZeitschrift fur Naturforschung - Section C Journal of Biosciences - Tập 51 Số 5-6 - Trang 379-385 - 1996
A. Congiu Castellano, Mario Barteri, A. Bianconi, Fabio Bruni
Abstract
For the first time a comparative study on conformational differences between native oval buminand its heat-stable form, called S-ovalbumin. using small angle x-ray scattering, is reported. To detect a different pathway in the folding mechanism of the two proteins, scattering measurements have been performed on ovalbumin and S-ovalbumin den...... hiện toàn bộ
The Topology of the Plastoquinone and Herbicide Binding Peptides of Photosystem II in the Thylakoid MembraneZeitschrift fur Naturforschung - Section C Journal of Biosciences - Tập 41 Số 1-2 - Trang 240-246 - 1986
Achim Trebst
Abstract
The 32 kDa herbicide and QB binding peptide (D-1 protein) and its homologous 34 kDa peptide (D-2 protein) are integral membrane subunits of photosystem II. A model for their folding through the thylakoid membrane in five transmembrane a-helices is proposed from the comparison of amino acid sequence and hydropathy index...... hiện toàn bộ
Herbicide Cross-Resistance and Mutations of the psbA Gene in Chlamydomonas reinhardtiiZeitschrift fur Naturforschung - Section C Journal of Biosciences - Tập 45 Số 11-12 - Trang 1142-1150 - 1990
Günter F. Wildner, Ursula Heisterkamp, Achim Trebst
The resistance against herbicides (inhibitors of the electron accepting side) of photosystem II originates from mutations of the psb A gene, coding for the D 1 or QB binding protein. Each of the five mutants used in the present study had single base changes in the psbA gene that resulted in a unique amino acid substitution at a different residue of the D1 protein (Val-...... hiện toàn bộ
Amino Acid Substitutions in the D1 Protein of Photosystem II Affect QB -Stabilization and Accelerate Turnover of D1Zeitschrift fur Naturforschung - Section C Journal of Biosciences - Tập 45 Số 5 - Trang 402-407 - 1990
Nir Ohad, Dekel Amir-Shapira, Hiroyuki Koike, Yorinao Inoue, Itzhak Ohad, Joseph Hirschberg
Abstract
Isogenic strains of Synechococcus PCC 7942 were genetically engineered so that copy I of the gene psbA was mutated at specific sites. These mutations resulted in replacements of Ser 264 by Gly or Ala and of Phe 255 by Tyr or Leu in the D1 protein. The mutants were resistant to herbicides inhibiting electron transfer in photosystem II. All m...... hiện toàn bộ
PAPS-Reductase from Escherichia coli: Characterization of the Enzyme as Probe for ThioredoxinsZeitschrift fur Naturforschung - Section C Journal of Biosciences - Tập 42 Số 1-2 - Trang 93-102 - 1987
Jens D. Schwenn, Ulrich Schriek
Abstract
PAPS-reductase from Escherichia coli was em ployed to detect thioredoxins from pro- and eukaryotic organisms. A simple method for the isolation of this enzyme and properties of the enzymatic assay were described. A comparison betw een thioredoxins detected by the PAPS-reductase and the Fructose-bisphosphatase or NADP malate dehydrogenase wa...... hiện toàn bộ