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Journal articles on the topic '823/.7'

Author: Grafiati

Published: 25 July 2024

Last updated: 31 July 2025

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1

Cheng, Ke-Guang, Chun-Hua Su, Jia-Yan Huang, et al. "Synthesis and cytotoxic evaluation of several oleanolic acid–uracil/thymine conjugates." MedChemComm 7, no. 5 (2016): 972–81. http://dx.doi.org/10.1039/c6md00061d.

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2

Liang, Guang-Ping, Ji-Xin Li, Jue Zhang, et al. "In Vitro Antitumor Activities of Biologically Active Extracts and Isolated Phytochemicals From Rabdosia latifolia C. Y. Wu Et H. W. Li in Addenda." Natural Product Communications 15, no. 5 (2020): 1934578X2092627. http://dx.doi.org/10.1177/1934578x20926277.

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To investigate the antitumor activities, as well as phytochemical constituents of Rabdosia latifolia C. Y. Wu et H. W. Li in Addenda ( R. latifolia) extracts, the light petroleum, dichloromethane, ethyl acetate, n-butanol, and water extracts from R. latifolia were determined by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assays on MCF-7, HepG2, A549, Hela, and BGC-823 cells. We further examined cell cycle and apoptosis of the biologically active extracts on MCF-7 cells. The constituents of the biologically active extracts were determined using ultra-performance liquid ch

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3

Lan, Hairong, Junying Song, Juan Yuan, et al. "Synthesis, Biological Evaluation, DNA Binding, and Molecular Docking of Hybrid 4,6-Dihydrazone Pyrimidine Derivatives as Antitumor Agents." Molecules 28, no. 1 (2022): 187. http://dx.doi.org/10.3390/molecules28010187.

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In the present paper, on the basis of molecular hybridization, a series of 4,6-dihydrazone pyrimidine derivatives containing the pyridine moiety were synthesized, structurally characterized, and evaluated in vitro for their antitumor activity. According to the results, all the tested compounds demonstrated broad-spectrum antitumor activity against selected tumor cell lines (MCF-7, BGC-823, A549, and BEL-7402) and no obvious toxicity toward normal cells HL-7702. In particular, compounds 10a and 10f were found to be the most promising antitumor agents among the tested compounds against BGC-823 c

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Zhong, Hui, Qi Jiang, Cong Wu, et al. "Design, Synthesis, and Antitumor Activity Evaluation of Artemisinin Bivalent Ligands." Molecules 29, no. 2 (2024): 409. http://dx.doi.org/10.3390/molecules29020409.

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Five artemisinin bivalent ligands molecules 4a–4e were designed, synthesized, and confirmed by 1H NMR, 13C NMR, and low-resolution mass spectrometry, and the bioactivities of the target compounds were investigated against four human tumor cell lines in vitro, including BGC-823, HepG-2, MCF-7, and HCT-116. The results showed 4a, 4d, and 4e exhibited significantly tumor cell inhibitory activity compared with the artemisinin and dihydroartemisinin; compound 4e has good biological activity inhibiting BGC-823 with an IC50 value of 8.30 μmol/L. Then, the good correlations with biological results wer

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Morsi, Iman, and Mohamed Mansour Mohamed Mostafa. "Wireless Gas Detector System Using Microcontrollers, PLC and SCADA System for Monitoring Environmental Pollution." Applied Mechanics and Materials 249-250 (December 2012): 247–55. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.247.

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Gas identification represents a big challenge for improving detection and pattern recognition of each gas by using inexpensive gas sensor. This paper presents a gas detector system which is built to monitor, and measure gas pollutant emissions in the air and also used to detect different gases. The pollutants are ethane (C2H6) and methane (CH4) which are located beside the fertilizer factories in Alexandria Egypt and some other gases as hydrogen (H2), propane (C3H8) and isobutane (C4H10).The gas sensors TGS-2611, TGS-816, TGS-2620 and TGS-823 from Figaro Engineering Inc. are used to build agas

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Лысова, Г. В., Г. А. Биржевой та С. М. Образцов. "Температурная зависимость радиационного упрочнения стали ЭП-823 после облучения ионами Ni++с энергией 7 МэВ". Поверхность. Рентгеновские, синхротронные и нейтронные исследования. 2013, № 4 (2013): 36–41. http://dx.doi.org/10.7868/s020735281304015x.

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Li, Huangyong, Changshui Chen, Shengzhen Xu, and Xiufang Cao. "Synthesis and Bioevaluation of Thieno[2,3-d]pyrimidinone Derivatives as Potential Tumor Cell Growth Inhibitors." Journal of Chemistry 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/692074.

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A series of novel cycloalkylthieno[2,3-d]pyrimidinone derivatives have been conveniently synthesizedviathree steps including G-3CR, heterocyclization, and alkylation reactions as a part of our ongoing search for new bioactive molecules. The newly synthesized compounds were evaluated for their potential tumor cell growth inhibitory activity by standard MTT assay. The preliminary results show that compound6bexhibited better inhibitory activities against HepG2, MCF-7, and BCG-823 cell lines compared to the control.

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Stepanova, Ekaterina N., Galina P. Grabovetskaya, and Olga V. Zabudchenko. "Hydrogen Effect on the Creep of Titanium Alloy of the Ti-Al-V System." Defect and Diffusion Forum 385 (July 2018): 212–17. http://dx.doi.org/10.4028/www.scientific.net/ddf.385.212.

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Comparative studies of the effect of hydrogenation on creep regularities of the titanium alloy of the Ti–Al–V system in the fine-grained (dav ≈ 7 μm) and ultrafine-grained (dav ≈ 0.3 μm) states are performed for the creep rates in the interval 10-7–10–5 s-1 at temperatures in the range 723–823 K. Hydrogenation of the alloy to 0.23 % is found to lead to a decrease in the steady creep rate and increase in the time to failure with simultaneous decrease in the value of deformation to failure. Possible reasons for the violation of the creep power law for the hydrogenated alloy are discussed.

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9

Mi, Yingqi, Jingjing Zhang, Lulin Zhang, Qing Li, Yuanzheng Cheng, and Zhanyong Guo. "Synthesis, Characterization, and Evaluation of Nanoparticles Loading Adriamycin Based on 2-Hydroxypropyltrimethyl Ammonium Chloride Chitosan Grafting Folic Acid." Polymers 13, no. 14 (2021): 2229. http://dx.doi.org/10.3390/polym13142229.

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Chitosan nanoparticles have been considered as potential candidates for drug loading/release in drug delivery systems. In this paper, nanoparticles (HACAFNP) loading adriamycin based on 2-hydroxypropyltrimethyl ammonium chloride chitosan grafting folic acid (HACF) were synthesized. The surface morphology of the novel nanoparticles was spherical or oval, and the nanoparticles exhibited a relatively small hydrodynamic diameter (85.6 ± 2.04 nm) and positive zeta potential (+21.06 ± 0.96 mV). The drug release of nanoparticles was assayed and represented a burst effect followed by a long-term stead

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He, Y., X. Cao, Y. Kong та ін. "Apoptosis-promoting and migration-suppressing effect of alantolactone on gastric cancer cell lines BGC-823 and SGC-7901 via regulating p38MAPK and NF-κB pathways". Human & Experimental Toxicology 38, № 10 (2019): 1132–44. http://dx.doi.org/10.1177/0960327119855128.

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Background: Gastric cancer is a malignant tumor with high incidence rate and mortality rate. Purpose: In this study, we investigated the anti-cancer effect of alantolactone, a sesquiterpene lactone, on gastric cancer cell lines BGC-823 and SGC-7901. Methods: BGC-823 and SGC-7901 cells were treated with different concentrations of alantolactone, Hoechst 33258 staining, flow cytometry, wound healing assay, invasion assay, colony forming assay, quantative polymerase chain reaction, and western blot analysis were used to evaluate the anticancer activity of alantolactone to gastric cancer. Results:

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Wu, Q., XF Lin, XF Ye, B. Zhang, Z. Xie, and WJ Su. "Ubiquitinated or sumoylated retinoic acid receptor alpha determines its characteristic and interacting model with retinoid X receptor alpha in gastric and breast cancer cells." Journal of Molecular Endocrinology 32, no. 3 (2004): 595–613. http://dx.doi.org/10.1677/jme.0.0320595.

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Retinoic acid receptor alpha (RARalpha) plays an important role in mediating all-trans retinoic acid (ATRA) signals. In this study, we found that ATRA up-regulated RARalpha mRNA and protein expression in gastric cancer BGC-823 cells. However, in breast cancer MCF-7 cells it down-regulated RARalpha protein expression with no effect on its RARalpha mRNA. Immunoprecipitation/Western blot analysis showed that, although sumoylated and ubiquitinated RARalpha existed simultaneously in both cancer cell lines, ATRA exerted different regulatory effects on sumoylation and ubiquitination of RARalpha. In M

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Lysova, G. V., G. A. Birzhevoi, and S. M. Obraztsov. "Temperature dependence of the radiation-induced hardening of EP-823 steel after 7-MeV Ni++-ion irradiation." Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques 7, no. 2 (2013): 328–32. http://dx.doi.org/10.1134/s1027451013020390.

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13

Yan, Jie, Qin Luo, Fei Long, and Mei-Lian Zhao. "Malconenoside A, a New Phenolic Glycoside from Bupleurum malconense." Natural Product Communications 16, no. 9 (2021): 1934578X2110374. http://dx.doi.org/10.1177/1934578x211037410.

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A new phenolic glycoside, 7-(4- O- β-D-glucopyranosyl, 3-methoxyphenyl)-6,8-dihydrofuro[3′,4′:7,8]naphtho[1,2-d][1,3]dioxol-10(7H)-one, named malconenoside A (1), was isolated from Bupleurum malconense Shan et Y. Li . The structure, including absolute configurations, was assigned by using spectroscopic methods and ECD calculation. Biological activities of compound 1 towards human cancer cells (HepG2, BGC-823, and A549) were evaluated. The most sensitive two cell lines were HepG2 and BGC823, in which the IC50 values of compound 1 were 8.70 and 16.94 μM, respectively.

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Karpova, Darja, Michael P. Rettig, Linda Eissenberg, et al. "Combined Targeting of CXCR2 and VLA4 Results in Rapid and Synergistic Mobilization of Hematopoietic Stem and Progenitor Cells in Mice." Blood 128, no. 22 (2016): 659. http://dx.doi.org/10.1182/blood.v128.22.659.659.

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Abstract Introduction : Since the first description of hematopoietic stem and progenitor cell (HSPC) mobilization over forty years ago, it has become the standard of care for both autologous and allogeneic transplantation. A five-day course of G-CSF represents the most commonly used mobilization regimen today. The CXCR4 inhibitor, plerixafor, is a more rapid but weak mobilizer when used as a single agent, thus emphasizing the need for faster acting agents with more predictable mobilization responses and fewer side effects. Methods : Given the critical role of VLA4/VCAM1 signaling for migration

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15

Norikawa, Yutaro, Kouji Yasuda, and Toshiyuki Nohira. "Effect of Temperature on Grain Growth during Ti Electrodeposition in Lif–LiCl Eutectic Melt." ECS Meeting Abstracts MA2022-01, no. 23 (2022): 1197. http://dx.doi.org/10.1149/ma2022-01231197mtgabs.

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1. Introduction Ti has superior properties, such as high specific strength, corrosion resistance, biocompatibility, and is used for many fields such as airplane, chemical plant, consumer products. However, its high manufacturing cost and poor processability have hindered its further spread. Thus, a number of smelting processes and processing methods have been investigated to reduce the cost and spread the use of Ti. Among them, plating Ti metal on inexpensive substrates is one of the methods that can utilize the surface properties of Ti. Electrodeposition is a promising plating method from the

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16

Wu, Hong Da, Li Lei, Ying Gui Jia, and Xin Gui. "Study on Pyrolysis Behavior of Yttrium Oxalate and Kinetic of Yttria Grain Grown." Advanced Materials Research 236-238 (May 2011): 1679–86. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1679.

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The precursor of yttria was prepared by yttrium nitrate and ammonium oxalate in water solution. Pyrolysis behavior of the precursor and the characterization of yttria phase transformation were studied through thermoanalysis. The grain growth kinetic behavior of yttria nanopowders was investigated by the X-ray powder diffraction (XRD) result of the powders obtained through roasting the precursor. Pattern of the yttria powders and agglomeration of its grain were measured by means of SEM and laser particle size analysis methods. The results suggested that cubic crystal phase yttria could be obtai

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17

Wu, Jia, Zai-Qi Zhang, Xu-Dong Zhou, et al. "New Terpenoids from Potentilla freyniana Bornm. and Their Cytotoxic Activities." Molecules 27, no. 12 (2022): 3665. http://dx.doi.org/10.3390/molecules27123665.

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Two new A-ring contracted triterpenoids, madengaisu A and madengaisu B, and one undescribed ent-kaurane diterpenoid, madengaisu C, along with 20 known compounds were isolated from the roots of Potentilla freyniana Bornm. The structures were elucidated using extensive spectroscopic techniques, including 1D and 2D-NMR, HR-ESI-MS, ECD spectra, IR, and UV analysis. Moreover, all isolated constituents were evaluated for their anti-proliferative activity against RA-FLS cells and cytotoxic activities against the human cancer cell lines Hep-G2, HCT-116, BGC-823, and MCF-7. Ursolic acid and pomolic aci

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18

Sawyer, Carol F. "Washburn AL (1956) Classification of patterned ground and review of suggested origins.Geological Society of America Bulletin67(7): 823–865." Progress in Physical Geography: Earth and Environment 36, no. 3 (2012): 440–48. http://dx.doi.org/10.1177/0309133312438909.

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19

Gottlieb, Michael. "Comparison of trimethoprim-sulfamethoxazole versus placebo for uncomplicated skin abscesses." CJEM 19, no. 04 (2016): 308–11. http://dx.doi.org/10.1017/cem.2016.367.

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Clinical question In patients with uncomplicated abscesses receiving incision and drainage, does the addition of trimethoprim-sulfamethoxazole result in improved clinical resolution at 7 to 14 days after treatment when compared with placebo? Article chosen Talan DA, Mower WR, Krishnadasan A, et al. Trimethoprim-sulfamethoxazole versus placebo for uncomplicated skin abscess. N Engl J Med 2016;374(9):823-32. Objective The primary objective of this study was to compare the clinical cure rates at 7 to 14 days after the end of the treatment period among patients receiving either trimethoprim-sulfam

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20

Tzakou, Olga, Philippos Mylonas, Constantinos Vagias, and Panos V. Petrakis. "Iridoid Glucosides with Insecticidal Activity from Galium melanantherum." Zeitschrift für Naturforschung C 62, no. 7-8 (2007): 597–602. http://dx.doi.org/10.1515/znc-2007-7-823.

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The insecticidal activity of the endemic species Galium melanantherum was evaluated against Crematogaster scutellaris ants and Kalotermes flavicollis termites. Iridoid glucosides 1-7 were isolated for the first time as metabolites of the investigated plant, along with the coumarin scopolin. The main components of the extract were found to be the non-acetylated iridoids: geniposidic acid (1), 10-hydroxyloganin (2), deacetyldaphylloside (3), monotropein (4), deacetylasperulosidic acid (5) and scandoside (6), while asperulosidic acid (7) was present only in minute quantities. All isolated metabol

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21

Zaleski, John. "Who Is the Man on the Camel?: Historical Exegesis of the Hebrew Bible and Christian-Muslim Debate." Medieval Encounters 26, no. 1 (2020): 49–80. http://dx.doi.org/10.1163/15700674-12340060.

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Abstract This article examines Christian and Muslim exchanges concerning Isaiah 21:7 and Deuteronomy 18:15, biblical texts that Muslims interpreted as referring to the Prophet Muḥammad. The focus of the article is the well-known letter in which the East Syrian Catholicos, Timothy I (d. 823), reports his debate with the Caliph al-Mahdī. In this letter, Timothy draws upon exegetical traditions rooted in Theodore of Mopsuestia (d. 428) in order to undercut Muslim interpretation of Isaiah 21:7 and Deuteronomy 18:15 by insisting upon a strictly historical interpretation of these verses. The histori

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Li, Xueyan, Xu Fan, Xiaoming Yin, Huajian Liu, and Yi Yang. "Alteration of N6-methyladenosine epitranscriptome profile in unilateral ureteral obstructive nephropathy." Epigenomics 12, no. 14 (2020): 1157–73. http://dx.doi.org/10.2217/epi-2020-0126.

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Aim: To reveal the alterations of N6-methyladenosine (m6A) epitranscriptome profile in kidney after unilateral ureteral obstruction in mice. Materials & methods: Total renal m6A and expressions of methyltransferases and demethylases were detected by colorimetric quantification method, real-time PCR and western blot, respectively. Methylated RNA immunoprecipitation sequencing was performed to map epitranscriptome-wide m6A profile. Results: Total m6A levels were time-dependent decreased within 1 week, with the lowest level detected at day 7. A total of 823 differentially methylated transcrip

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Reinhardt, B., R. Buras, L. Bugliaro, S. Wilbert, and B. Mayer. "Determination of circumsolar radiation from Meteosat Second Generation." Atmospheric Measurement Techniques 7, no. 3 (2014): 823–38. http://dx.doi.org/10.5194/amt-7-823-2014.

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Abstract. Reliable data on circumsolar radiation, which is caused by scattering of sunlight by cloud or aerosol particles, is becoming more and more important for the resource assessment and design of concentrating solar technologies (CSTs). However, measuring circumsolar radiation is demanding and only very limited data sets are available. As a step to bridge this gap, a method was developed which allows for determination of circumsolar radiation from cirrus cloud properties retrieved by the geostationary satellites of the Meteosat Second Generation (MSG) family. The method takes output from

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Derendorp, L., R. Holzinger, A. Wishkerman, F. Keppler, and T. Röckmann. "VOC emissions from dry leaf litter and their dependence on temperature." Biogeosciences Discussions 7, no. 1 (2010): 823–54. http://dx.doi.org/10.5194/bgd-7-823-2010.

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Abstract. Emissions of several volatile organic compounds (VOCs) from dry leaf litter at temperatures in the range 20–100 °C are reported for different plant species. The emission rates of ethane, ethene, propane, propene, n-pentane and methyl chloride increase exponentially with temperature and follow the Arrhenius relation. Emission rates up to 650 ng/gdw/h were observed for hydrocarbons at 70 °C, while for methyl chloride emission rates up to 18 μg/gdw/h were observed at this temperature. The emissions are of abiotic origin, which is indicated by activation energies higher than 50 kJ/mol. T

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25

Melkonian, A. K., M. J. Willis, M. E. Pritchard, A. Rivera, F. Bown, and S. A. Bernstein. "Satellite-derived volume loss rates and glacier speeds for the Cordillera Darwin Icefield, Chile." Cryosphere 7, no. 3 (2013): 823–39. http://dx.doi.org/10.5194/tc-7-823-2013.

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Abstract. We produce the first icefield-wide volume change rate and glacier velocity estimates for the Cordillera Darwin Icefield (CDI), a 2605 km2 temperate icefield in southern Chile (69.6° W, 54.6° S). Velocities are measured from optical and radar imagery between 2001–2011. Thirty-six digital elevation models (DEMs) from ASTER and the SRTM DEM are stacked and a weighted linear regression is applied to elevations on a pixel-by-pixel basis to estimate volume change rates. The CDI lost mass at an average rate of −3.9 ± 1.5 Gt yr−1 between 2000 and 2011, equivalent to a sea level rise (SLR) of

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Tsoncheva, Vania L., Kristina A. Todorova, and Vera A. Maximova. "Decreased DNA Repair Capacity of UV-Irradiated Cells Following Interferon Treatment." Zeitschrift für Naturforschung C 63, no. 7-8 (2008): 605–11. http://dx.doi.org/10.1515/znc-2008-7-823.

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The aim of this study was to examine the effect of interferons (IFNs) on the recovery of UV-damaged cells by means of measuring cell viability rates. The influence of the recombinant human interferons IFN-α, IFN-βand IFN-γ on the repair capacity of the UV-irradiated human cell lines WISH and HeLa was studied. The ability of cells to repair UV-induced damage was determined by the comet assay and both short- and long-term survival assays in proliferating cell cultures. We found that INFs negatively regulated DNA repair in cells damaged by UV light. One day after treatment, in both cell lines tes

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27

陈, 菁., та 玉真白. "正定Lagrange系统极小概率测度的惟一遍历性". Science in China Series A-Mathematics (in Chinese) 36, № 7 (2006): 823–26. http://dx.doi.org/10.1360/za2006-36-7-823.

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Koda, Masao, Chikato Mannoji, Takashi Itabashi, et al. "Intramedullary hemorrhage caused by spinal cord hemangioblastoma: a case report." BMC Research Notes 7, no. 1 (2014): 823. http://dx.doi.org/10.1186/1756-0500-7-823.

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Koster, Chris G. de, Gerard J. Niemann, and Wigger Heerma. "Fast Atom Bombardment Mass Spectrometry of Coumaric Acids." Zeitschrift für Naturforschung C 40, no. 7-8 (1985): 580–82. http://dx.doi.org/10.1515/znc-1985-7-823.

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Abstract The technique of positive fast atom bombardment mass spectrometry combined with collisional activation and metastable ion data has been shown to provide molecular mass and useful fragmentation information for discrimination between the coumaric acid isomers. In addition to the occurrence of an ortho-effect, also para and meta positions could be distinguished.

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H. J., MacCordick. "Aspects of Mycobacterial Response to Beryllate Ions in vitro." Zeitschrift für Naturforschung C 41, no. 7-8 (1986): 802–4. http://dx.doi.org/10.1515/znc-1986-7-823.

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Abstract Comparative growth measurements of the mycobacterial species Mycobacterium phlei and Mycobacterium tuberculosis were carried out with liquid cultures supplemented with oxalatoberyllate ions in the concentration range 0-120 μᴍ Be. For both species, the effect of beryllium on specific growth parameters can be represented by a Be concentration-dependent, exponential expression. Evidence for beryllium binding to cellular phospholipids (~ 15% of Be uptake) is provided by 31P NMR spectroscopy, thin-layer chromatography and atomic absorption spectrometry.

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Wink, Michael. "Site of Lupanine and Sparteine Biosynthesis in Intact Plants and in vitro Organ Cultures." Zeitschrift für Naturforschung C 42, no. 7-8 (1987): 868–72. http://dx.doi.org/10.1515/znc-1987-7-823.

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[14C]Cadaverine was applied to leaves of Lupinus polyphyllus, L. albas, L. angustifolius, L. perennis, L. mutabilis, L. pubescens, and L. hartwegii and it was preferentially incorporated into lupanine. In Lupinus arboreus sparteine was the main labelled alkaloid, in L. hispanicus it was lupinine. A pulse chase experiment with L. angustifolius and L. arboreus showed that the incorporation of cadaverine into lupanine and sparteine was transient with a maximum between 8 and 20 h. Only leaflets and chlorophyllous petioles showed active alkaloid biosynthesis, whereas no incorporation of cadaverine

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Guthrie, George D., David L. Bish, and Robert C. Reynolds. "Modeling the X-ray diffraction pattern of opal-CT." American Mineralogist 80, no. 7-8 (1995): 869–72. http://dx.doi.org/10.2138/am-1995-7-823.

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Hurlbut, Cornelius S., and James B. Thompson. "Memorial of Harold Williams Fairbairn, 1906-1994." American Mineralogist 81, no. 7-8 (1996): 1018–19. http://dx.doi.org/10.2138/am-1996-7-823.

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Barkov, Andrei Y., Kauko V. O. Laajoki, Stanislav S. Gornostayev, Yakov A. Pakhomovskii, and Yuri P. Men'shikov. "Sorosite, Cu(Sn,Sb), a new mineral from the Baimka placer deposit, western Chukotka, Russian Far East." American Mineralogist 83, no. 7-8 (1998): 901–6. http://dx.doi.org/10.2138/am-1998-7-823.

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Kirkpatrick, R. James, Ping Yu, Xiaoqiang Hou, and Yeongkyoo Kim. "Interlayer structure, anion dynamics, and phase transitions in mixed-metal layered hydroxides; variable temperature35Cl NMR spectroscopy of hydrotalcite and Ca-aluminate hydrate (hydrocalumite)." American Mineralogist 84, no. 7-8 (1999): 1186–90. http://dx.doi.org/10.2138/am-1999-7-823.

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Kirschfeld, K. "The Role of Dorsal Rim Ommatidia in the Bee's Eye." Zeitschrift für Naturforschung C 43, no. 7-8 (1988): 621–23. http://dx.doi.org/10.1515/znc-1988-7-823.

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A recent model of celestial e-vector analysis by the bee assumes that polarization information is transformed into modulation of perceived brightness while the bee scans the sky by rotating its field of view. It is shown that the suggested simple strategy to read compass information from the polarization pattern of the sky in natural conditions can work only in a part of the sky close to the zenith. The bee would need a different strategy for other regions of the sky.

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Radunz, A., and G. H. Schmid. "Comparative Immunological Studies on the CF1-Complex in Mutants of N. tabacum, Exhibiting Different Capacities for Photosynthesis and Photorespiration and Different Chloroplast Structures." Zeitschrift für Naturforschung C 44, no. 7-8 (1989): 689–97. http://dx.doi.org/10.1515/znc-1989-7-823.

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We have compared by means of rocket immunoelectrophoresis the amount of CF1-complex in N. tabacum mutants with that in the wild type N. tabacum var. John William’s Broadleaf. Some of these mutants differ from the wild type not only by higher photosynthetic and photorespiratory activities but also by their chloroplast structure. The amount of CF1, present was related to the chlorophyll content. However, no correlation between the amount of CF1, present and a higher photosynthetic and photorespiratory activity was found. On the other hand the molar ratio of CF1, to chlorophyll seems to depend in

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Klein, Birgit, Hermann Schildknecht, Monika Hilker, and Siegfried Bombosch. "Oviposition Deterrent from Larval Frass of Spodoptera littoralis (Boisd.)." Zeitschrift für Naturforschung C 45, no. 7-8 (1990): 895–901. http://dx.doi.org/10.1515/znc-1990-7-823.

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Abstract A synthetic mixture containing 1-indanone, 2-pentanone, 2-methyl-3-pentanone, 3-mcthyl- 2-pentanone, 2-methylcyclopentanone. 1-hydroxy-propanone. acetophenone, benzaldehyde. n-nonanal, n-decanal, nerolidol, eugenol, thymol, carvacrol and phythol deters oviposition of the Egyptian cotton leaf worm, Spodoptera littoralis (Boisd.). All compounds were identified from larval frass of S. littoralis.

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39

Suwalsky, M., M. A. Espinoza, I. Sánchez, and F. Villena. "X-Ray Studies on Phospholipid Bilayers. XI. Interactions with Chloramphenicol." Zeitschrift für Naturforschung C 46, no. 7-8 (1991): 647–55. http://dx.doi.org/10.1515/znc-1991-7-823.

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Abstract Chloramphenicol is a widely used antibiotic with low levels of toxicity. However, scanning electron microscopy revealed morphological changes in human erythrocytes when they interacted in vitro with therapeutical concentrations of chloram phenicol. To explain this shape change, a study concerned with the possible interactions of this antibiotic with bilayers built-up of phospholipids located in either side of the red cell membrane was performed by X-ray diffraction. Results indicated that chloramphenicol was unable to perturb in any significant extent the structure of the phospholipid

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40

Becker, Erwin W. "Dynamics and Kinetics of Enzymes Kinetic Equilibrium of Forces in Biochemistry." Zeitschrift für Naturforschung C 47, no. 7-8 (1992): 628–33. http://dx.doi.org/10.1515/znc-1992-7-823.

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To explain the high specificity, high reaction rate, and high thermodynamic efficiency in enzymatic processes, cooperation of the enzyme with a molecular transfer unit is assumed. A “kinetic equilibrium of forces” is suggested, which enables high reaction rates to occur under equilibrium conditions and a thorough examination of the substrate to be made without consumption of free energy. In case of ATPases, ion-binding proteins are the most probable transfer units. By analyzing the elementary effect in muscle contraction it is shown that the new theorem may be of substantial value in elucidati

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41

Gierer, Alfred. "Networks of Gene Regulation, Neural Development and the Evolution of General Capabilities, Such as Human Empathy." Zeitschrift für Naturforschung C 53, no. 7-8 (1998): 716–22. http://dx.doi.org/10.1515/znc-1998-7-823.

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Abstract Gene Regulation, Brain Evolution, Neural Network, Empathy, Evolution of Altruism A network of gene regulation organized in a hierarchical and combinatorial manner is crucially involved in the development of the neural network, and has to be considered one of the main substrates of genetic change in its evolution. Though qualitative features may emerge by way of the accumulation of rather unspecific quantitative changes, it is reasonable to assume that at least in some cases specific combinations of regulatory parts of the genome initiated new directions of evolution, leading to novel

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42

Arriaga-Giner, Fco Javier, Angel Rumbero та Eckhard Wollenweber. "16α,19-Diacetoxy-ewf-kaurane, a New Natural Diterpene from the Exudate of Ozothamnus scutellifolius (Asteraceae)". Zeitschrift für Naturforschung C 54, № 7-8 (1999): 602–4. http://dx.doi.org/10.1515/znc-1999-7-823.

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Abstract Leaf and stem exudate of Ozothamnus scutellifolius, previously reported to contain 21 flavonoid aglycones, was now investigated for its terpenoid composition. Seven structurally related diterpenoids were identified. One of them, 16a,19-diacetoxy-enf-kaurane, is a novel natural product.

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43

Céspedes, Carlos, Lahoucine Achnine, Julio Alarcón, José Becerra та Blas Lotina-Hennsen. "Photosynlhetic Inhibitory Activity of Dihydro-β-agarofurans Sesquiterpenes from Maytenus dislicha and Maytenus boaria (Celastraceae)". Zeitschrift für Naturforschung C 55, № 7-8 (2000): 631–37. http://dx.doi.org/10.1515/znc-2000-7-823.

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Abstract The effects of 9β-benzoyloxy-la, 2α, 6β, 8α, 15-pentaacetoxy-dihydro-β-agarofuran and 9β furoyloxy-1α, 6β, 8α-triacetoxy-dihydro-β-agarofuran, major phytogrowth inhibitors isolated from the aerial parts of Maytenus disticha (Celastraceae) and seeds of Maytenus boaria (Celastaraceae), respectively, on different photosynthetic activities of isolated spinach chloroplasts have been investigated. Photophosphorylation and electron transport (basal, phosphorylating and uncoupled) were inhibited in a concentration dependent manner by both compounds, therefore acting as Hill reaction inhibitor

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Różycka-Roszak, Bożenna, and Hanna Pruchnik. "Influence of Dodecyltrimethylammonium Halides on Interaction of Phenyltin Compounds with Model Membranes." Zeitschrift für Naturforschung C 56, no. 7-8 (2001): 623–28. http://dx.doi.org/10.1515/znc-2001-7-823.

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The effects were studied of dodecyltrimethylammonium chloride (DTAC), dodecyltrimethylammonium bromide (DTAB) and dodecyltrimethylammonium iodide (DTAI) on thermotropic phase behaviour of phosphatidylcholine bilayers, as well as on 1H NMR and 31P NMR spectra, in the presence of diphenyltin dichloride (DPhT) and triphenyltin chloride (TPhT). The obtained results indicate that in the presence of the surfactant studied the interaction of phenyltin compounds with model membranes was changed and the changes depended on the kind of the counterion. The surfactants studied (especially DTAC) decrease

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45

Farooq, Afgan, M. Iqbal Choudhary, Satoshi Tahara, Atta-ur-Rahman, K. Hüsnü Can Başerc та Fatih Demirci. "The Microbial Oxidation of (–)-β-Pinene by Botrytis cinerea". Zeitschrift für Naturforschung C 57, № 7-8 (2002): 686–90. http://dx.doi.org/10.1515/znc-2002-7-823.

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(-)-β-pinene, a flavor and fragrance monoterpene is an important constituent of essential oils of many aromatic plants. It was oxidized by a plant-pathogenic fungus, Botrytis cinerea to afford four metabolites characterized as (-)-6α-hydroxy-β-pinene, (-)-4β,5β-dihydroxy- β-pinene, (-)-2β,3β-dihydroxypinane, and (-)-4β-hydroxy-β-pinene-6-one by detailed spectroscopic studies along with other known metabolites.

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46

Ansorge, Siegfried, Dirk Reinhold та Uwe Lendeckel. "Propolis and Some of its Constituents Down-Regulate DNA Synthesis and Inflammatory Cytokine Production but Induce TGF-β1 Production of Human Immune Cells". Zeitschrift für Naturforschung C 58, № 7-8 (2003): 580–89. http://dx.doi.org/10.1515/znc-2003-7-823.

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Abstract Propolis, the resinous product collected by honey bees from plants, is used as folk medicine since ancient time. Recently, immunoregulatory and anti-inflammatory properties of propolis have been published. The detailed mechanisms of actions of propolis and its components on immune cells, however, are still unknown. Therefore, we studied the effects of different propolis extracts, of the flavonoids hesperidin and quercetin as well as of caffeic acid phenethyl ester (CAPE) on basic human immune cell functions. In detail, we measured the effects on DNA synthesis and production of differe

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Haupt, Joachim, and Frank Müller. "New Products of Defense Secretion in South East Asian Whip Scorpions (Arachnida: Uropygi: Thelyphonida)." Zeitschrift für Naturforschung C 59, no. 7-8 (2004): 579–81. http://dx.doi.org/10.1515/znc-2004-7-823.

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AbstractSecretion products from the opisthosomal defense gland of south east Asian whip scorpions were identified for the first time by gas-chromatography and mass-spectrometry. Specimens of the genera Hypoctonus, Typopeltis and Ginosigma were tested. While some ingredients are present in large concentrations, others are possibly only side products and may be synthesized more incidentally. For this reason no important functional role is attributed to them. There are considerable individual differences concerning the concentrations of various ingredients. While the secretion products of most sp

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Hillerns, Pablo Ibieta, Yuangang Zu, and Michael Wink. "Binding of Phytoestrogens to Rat Uterine Estrogen Receptors and Human Sex Hormone-binding Globulins." Zeitschrift für Naturforschung C 60, no. 7-8 (2005): 649–56. http://dx.doi.org/10.1515/znc-2005-7-823.

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The interaction of phytoestrogens with the most important binding sites of steroid hormones, i.e. sex hormone-binding globulin and estrogen receptors, was investigated. Relative binding affinities and association constants for 21 compounds among them isoflavones, flavones, flavonols, flavanones, chalcones and lignans were determined. The lignan nordihydroguaiaretic acid weakly displaced 17β-[3H]-estradiol from estrogen receptor and Scatchard analysis suggests non-conformational changes. Compounds from Glycyrrhiza glabra, liquiritigenin and isoliquiritigenin, showed estrogenic affinities to bot

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Zdražilová, Pavla, Šárka Štĕpánková, Alena Komersová, Martina Vránová, Karel Komers, and Alexander Čegan. "Kinetics of 13 New Cholinesterase Inhibitors." Zeitschrift für Naturforschung C 61, no. 7-8 (2006): 611–17. http://dx.doi.org/10.1515/znc-2006-7-823.

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Kinetics of hydrolysis of acetylcholine and acetylthiocholine by two types of acetylcholinesterase and butyrylcholinesterase inhibited by 13 new inhibitors (5 carbamates and 8 carbazates - hydrazinium derivatives) was measured in vitro in a batch reactor at 25 °C, pH 8, ionic strength 0.11 ᴍ and enzyme activity 3.5 U by four nondependent analytical methods. Sevin®, rivastigmin (Exelon®) and galantamin (Reminyl®) served as comparative inhibiting standards. Kinetics of hydrolyses inhibited by all studied carbamates, sevin, carbazates (with exceptions) and rivastigmin (with exceptions) can be sim

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BENSON, JACK A. "A Novel Gaba Receptor in the Heart of a Primitive Arthropod, Limulus Polyphemus." Journal of Experimental Biology 147, no. 1 (1989): 421–38. http://dx.doi.org/10.1242/jeb.147.1.421.

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1. The isolated, intact heart of the marine arachnid Limulus polyphemus continues to beat in vitro for many hours. Application of γaminobutyric acid (GABA) decreased the heart beat frequency with a threshold of 3xlO−7 moll−1 and an EC50 of 2.0±0.6xlO−5 moll−1 (mean±s.D., N = 8). At lO−4moll−1 and above the heart beat was completely and reversibly inhibited. 2. The agonist potency profile of the Limulus heart chronotropic GABA receptor was very similar to that of the vertebrate GABAA receptor: muscimol &gt; ZAPA&gt;GABA=⋍TACA&gt;isoguvacine&gt;THIP&gt;3-aminopropane sulphoni

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