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Littérature scientifique sur le sujet « 741.9/4 »

Auteur : Grafiati

Publié le 25 juillet 2024

Mis à jour le 26 juillet 2024

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Articles de revues sur le sujet "741.9/4"

Dinges, Tim, Matthias Eul et Rainer Pöttgen. « TaRhGe with TiNiSi-type Structure ». Zeitschrift für Naturforschung B 65, n^o 1 (1 janvier 2010) : 95–98. http://dx.doi.org/10.1515/znb-2010-0117.

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The new germanide TaRhGe was prepared from the elements by arc-melting and subsequent annealing at 1020 K for 10 days. TaRhGe crystallizes with the TiNiSi-type structure, space group Pnma, Z = 4, oP12, a = 640.2(2), b = 383.2(2), c = 741.7(2) pm, wR2 = 0.0550, 432 F2 values, 20 parameters. The structure consists of a three-dimensional [RhGe] network of distorted RhGe4/4 tetrahedra with Rh-Ge distances ranging from 244 to 250 pm. The tantalum atoms are coordinated within this network by two folded and mutually tilted Rh3Ge3 hexagons. TaRhGe is Pauli-paramagnetic and shows no superconducting transition down to 3 K

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Johnscher, Michael, Frank Tappe, Oliver Niehaus et Rainer Pöttgen. « The equiatomic intermetallics REPtCd (RE= La, Ce, Pr, Nd, Eu) and magnetic properties of CeAuCd ». Zeitschrift für Naturforschung B 70, n^o 3 (1 mars 2015) : 197–202. http://dx.doi.org/10.1515/znb-2014-0255.

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AbstractThe cadmium intermetallics REPtCd (RE = La, Ce, Pr, Nd, Eu) and CeAuCd were synthesized by induction-melting of the elements in sealed niobium ampoules followed by annealing in muffle furnaces. The samples were characterized by powder X-ray diffraction. The structures of CePtCd (ZrNiAl type, $P\bar 62m,$a = 763.8(6), c = 409.1(4) pm, wR2 = 0.0195, 298 F2 values, 14 variables) and EuPtCd (TiNiSi type, Pnma, a = 741.3(2), b = 436.4(1), c = 858.0(4) pm, wR2 = 0.0385, 440 F2 values, 20 variables) were refined from single-crystal data. The REPtCd structures exhibit three-dimensional networks of corner- and edge-sharing Cd@Pt2/6Pt2/3 and Cd@Pt4/4 tetrahedra, which leave cages for the rare earth atoms. Temperature-dependent magnetic susceptibility data of CeAuCd reveal a paramagnetic to antiferromagnetic phase transition at TN = 3.7(5) K.

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Hou, Bolin, Sushi Liu, Ruiyun Huo, Yueqian Li, Jinwei Ren, Wenzhao Wang, Tao Wei et al. « New Diterpenoids and Isocoumarin Derivatives from the Mangrove-Derived Fungus Hypoxylon sp. » Marine Drugs 19, n^o 7 (24 juin 2021) : 362. http://dx.doi.org/10.3390/md19070362.

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Two new diterpenoids, hypoxyterpoids A (1) and B (2), and four new isocoumarin derivatives, hypoxymarins A–D (4–7), together, with seven known metabolites (3 and 8–13) were obtained from the crude extract of the mangrove-derived fungus Hypoxylon sp. The structures of the new compounds were elucidated on the basis of 1- and 2-dimensional (1D/2D) nuclear magnetic resonance (NMR) spectroscopic and mass spectrometric analysis. The absolute configurations of compounds 1, 2, 4, 5, and 7 were determined by comparison of experimental and calculated electronic circular dichroism (ECD) spectra, and the absolute configurations of C-4′ in 6 and C-9 in 7 were determined by [Rh2(OCOCF3)4]-induced ECD spectra. Compound 1 showed moderate α-glucosidase inhibitory activities with IC50 values of 741.5 ± 2.83 μM. Compounds 6 and 11 exhibited DPPH scavenging activities with IC50 values of 15.36 ± 0.24 and 3.69 ± 0.07 μM, respectively.

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Bock, JL, B. Wenz et RK Gupta. « Changes in intracellular Mg adenosine triphosphate and ionized Mg2+ during blood storage : detection by 31P nuclear magnetic resonance spectroscopy ». Blood 65, n^o 6 (1 juin 1985) : 1526–30. http://dx.doi.org/10.1182/blood.v65.6.1526.bloodjournal6561526.

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Abstract 31P nuclear magnetic resonance (NMR) spectroscopy was used to measure changes in intra-erythrocyte Mg adenosine triphosphate (MgATP) and free Mg2+ during blood storage at 4 degrees C in standard citrate preservation media. The extent of Mg2+ complexation of ATP and the concentration of free Mg2+ were measured from the Mg2+-dependent chemical shift differences, at 22 degrees C, between the P beta and P alpha resonances of intracellular ATP. This difference changed from 721.0 +/- 1.4 Hz (mean +/- SE) on the day of collection to 741.0 +/- 3.4 Hz after three to seven days and 774.0 +/- 2.8 Hz after 11 to 40 days storage in either acid-citrate-dextrose (ACD) or citrate-phosphate- dextrose-adenine (CPDA-1). Changes in intracellular pH, detected from shifts in the intracellular Pi resonance, averaged 0.27 units after 11 to 40 days of storage. These data indicate a sizable decrease in the extent of Mg2+ complexation of ATP, and a decrease by a factor of 2.6 in free Mg2+, during the shelf-life of blood stored in ACD or CPDA-1.

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Metzger, Brendan A., Nader Soltani, Alan J. Raeder, David C. Hooker, Darren E. Robinson et Peter H. Sikkema. « Multiple herbicide-resistant horseweed (Conyza canadensis) dose response to tolpyralate and tolpyralate plus atrazine and comparison to industry standard herbicides in corn ». Weed Technology 33, n^o 2 (avril 2019) : 366–73. http://dx.doi.org/10.1017/wet.2019.20.

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AbstractHorseweed biotypes resistant to glyphosate and ALS-inhibiting herbicides are becoming more prevalent in Canada and the United States and present a significant management challenge in field crops. Tolpyralate is a recently commercialized herbicide for use in corn that inhibits 4-hydroxyphenylpyruvate dioxygenase (HPPD), and there is little information regarding its efficacy on horseweed. Six field experiments were conducted in 2017 and 2018 at four locations in Ontario, Canada, to determine the biologically effective dose of tolpyralate and tolpyralate + atrazine and to compare label rates of tolpyralate and tolpyralate + atrazine to currently accepted herbicide standards for POST control of glyphosate and cloransulam-methyl resistant (MR) horseweed. At 8 wk after application (WAA), tolpyralate at 4.8 and 22.6 g ha–1provided 50% and 80% control, respectively. When applied with atrazine at a 1:33.3 tank-mix ratio, 22.3 + 741.7 g ha–1provided 95% control of MR horseweed. The addition of atrazine to tolpyralate at label rates improved control of MR horseweed to 98%, which was similar to the control provided by dicamba:atrazine and bromoxynil + atrazine. The results of this study indicate that tolpyralate + atrazine provides excellent control of MR horseweed POST in corn.

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Frisch, Gero, et Caroline Röhr. « Fehlende Glieder bekannter Reihen : Die Oxoferrate(III) Rb8[Fe2O7], Rb6[Fe2O6] und K4[Fe2O5] / Missing Links in Known Series : The Oxoferrates(III) Rb8[Fe2O7], Rb6[Fe2O6], and K4[Fe2O5] ». Zeitschrift für Naturforschung B 60, n^o 7 (1 juillet 2005) : 732–40. http://dx.doi.org/10.1515/znb-2005-0706.

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The title compounds were synthesized at temperatures between 775 and 1175 K from (mostly stoichiometric) mixtures of Fe2O3, elemental rubidium or potassium (A) and their hyperoxides AO2. The structures have been determined by single crystal X-ray diffraction. The alkaline rich ferrate(III) Rb8[Fe2O7] (Cs8[Fe2O7] structure type, space group P21/c, a = 696.7, b = 1722.1, c = 692.0 pm, β = 119.40°, Z = 2, R1 = 0.0496) exhibits diferrate anions [Fe2O7]8- composed of two vertexsharing [FeIIIO4] tetrahedra with a linear Fe-O-Fe bridge and nearly ideal 3m symmetry. This is in marked contrast to the Na homologue, where the diferrate anions are decidedly angular. In the series A3[FeO3], the anions in the compounds of the light alkaline cations are chains 1∞[FeO2O2/2]3−, but similar to the isotypic K6[Fe2O6] and to Cs6[Fe2O6] the new ferrate Rb6[Fe2O6] (K6Fe2O6 structure type, space group C2/m, a=741.8(2), b=1148.7(2), c=680.08(12) pm, β =103.65(2)°, Z = 4, R1 = 0.0370) contains isolated binuclear anions [O2FeO2FeO2]6− composed of two edge sharing [FeO4] tetrahedra. The new potassium ferrate of the series A4[Fe2O5], K4[Fe2O5] (space group P21/c, a = 645.91(14), b = 593.69(13), c = 1003.0(2) pm, β = 103.124(4)°, Z = 4, R1 = 0.0355), constitutes a new structure type, but its structure is still closely related to the Na compound, which crystallizes in the isomorphous subgroup P21/n with a doubled a axis. Both compounds are phylloferrates with layers 2∞[Fe2O5]4− consisting of six-membered rings of [FeO4] tetrahedra. In contrast, Rb4[Fe2O5] contains chains of vertex and edge sharing tetrahedra, so that in both series, A3[FeO3] and A4[Fe2O5], the linkedness of the ferrate tetrahedra increases with the ionic radii of the A counterions.

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Gong, Jianqing, Lilin Zhu, Jiusu Li et Da Shi. « Silica Fume and Nanosilica Effects on Mechanical and Shrinkage Properties of Foam Concrete for Structural Application ». Advances in Materials Science and Engineering 2020 (27 avril 2020) : 1–10. http://dx.doi.org/10.1155/2020/3963089.

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Adding the appropriate amount of silica fume (SF) or nanosilica (NS) can improve the strength and reduce the shrinkage of foam concrete (FC), thereby widening its application. This paper reports on a study of FC mechanical and shrinkage properties when varying SF and NS proportions were used to replace cement. Scanning electron microscopy (SEM) and nonmetallic ultrasonic detection were employed to investigate the mechanism of strength changes. The result showed that when the SF and NS content was 15% and 4%, in the 28 days, the compressive strength of FC peaked at 32.8 MPa and 35.8 MPa, and the flexural strength maximized at 7.9 MPa and 9.1 MPa, respectively. The autogenous shrinkage reached the minimum value, separately, i.e., 741.2 × 10−6 and 797.1 × 10−6. The dry shrinkage value was the highest (862.5 × 10−6 and 1387.5 × 10−6). The results indicated that the compressive and flexural strength of FC first increased and then decreased as SF and NS content increased. Autogenous shrinkage first decreased and then increased with the increase of SF or NS content. An opposite trend of dry shrinkage could be observed. FC made with NS had higher shrinkage than it did with SF. The results also indicated that there was a correlation between microstructure and sound velocity in the presence of SF or NS.

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Turgut, Emre, Akile Zengin, Yusuf Bag, Kuntay Kaplan, Orgun Gunes, Sinan Karatoprak, Fatih Sumer, Cemalettin Aydin et Cuneyt Kayaalp. « The association between psoas muscle area index and morbidity/mortality in laparoscopic gastric cancer surgery ». Medicine Science | International Medical Journal 11, n^o 3 (2022) : 1110. http://dx.doi.org/10.5455/medscience.2022.03.051.

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As advanced gastric cancer often leads to obstruction or cancer-related cachexia, gastric cancer seems to have a closer association with sarcopenia than other types of cancer. Our study aim was to investigate the relationship between the psoas muscle area (PSMA) and morbidity and mortality in patients undergoing gastric cancer surgery. The data of patients who underwent laparoscopic gastric resection between November 2014 and April 2020 were analyzed retrospectively. The intervertebral disc space was verified at L3-4 in the sagittal plane. The PSMA on the right and left sides were measured separately and then added to obtain the total PSMA. This value was then divided by the patient's height (m2) to calculate the psoas muscle area index (PSMAI) (mm2/m2). The mean PSMAI of men (741.1 mm2/m2) was significantly higher than that of women (502.1 mm2/m2) (p<0.001). While there was a positive correlation between the PSMAI and BMI (r:0.352, p:0.019 in women; r:0.447, p<0.001 in men), the correlation between PSMAI and age was negative (r: -0.369, p:0.014 in women; r:-0.349, p<0.001 in men). PSMAI was statistically lower in patients with attendant morbidity (p:0.035). There was no significant relationship between PSMAI and the first 30-day mortality rate (p:0.096); however, the association between PSMAI and both the 90-day mortality rate (p:0.023) and the total mortality rate (p:0.046) were significant. In our opinion, assessing gastric cancer patients for sarcopenia and supporting them with the necessary nutrition and exercise program prior to surgery can help predict and lower postoperative morbidity and mortality rates.

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Lusiantari, Rokhima, Miranti Dewi Pramaningtyas, Titis Nurmasitoh, Rachmi Hidayati Pattimura et Anggita Dewanti. « Shortening tends to increase aortic foam cell count and wall thickness in male Wistar rats ». Universa Medicina 37, n^o 1 (15 février 2018) : 13. http://dx.doi.org/10.18051/univmed.2018.v37.13-18.

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Background Shortening is widely used as raw material for bread and other foods. Hypercholesterolemia increases aortic arch foam cell formation and abdominal aortic wall thickness. This study aimed to determine the effect of shortening on the number of aortic arch foam cells and abdominal aortic wall thickness in rats. Methods This study was of experimental posttest control group design. Twenty four male Wistar rats were randomized into 4 groups. The negative control group (C-) received standard feed, the positive control group (C+) standard high-fat feed, group T1 shortening and standard feed at a ratio of 1:5 and group T2 shortening and standard feed at a ratio of 1:10. The interventions were given for 6 weeks through gavage. The foam cell count in the aortic arch and the thickness of the abdominal aortic wall were measured. One-way ANOVA test was used to analyze the data. Results There was no significant difference in the mean foam cell count of the aortic arch between the four groups C- (7.17 ± 4.17), C + (9.33 ± 7.01), T1 (11.83 ± 4.88) and T2 (9.33 ± 6.80) (p=0.598). The mean thickness of the abdominal aortic wall between the four groups C- (741.98 ± 60.67μm), C + (714.29 ± 90.59μm), T1 (838.90 ± 75.86 μm), and T2 (749.88 ± 99.37μm) also was not significantly different (p=0.110). Conclusion Shortening tends to increase the foam cell count of the aortic arch and the thickness of the abdominal aortic wall of rats.

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Karanastasi, E., W. Decraemer, P. E. Kyriakopoulou et R. Neilson. « First Report of the Stubby-Root Nematode Paratrichodorus teres Associated with Artichoke (Cynara scolymus) in Greece ». Plant Disease 89, n^o 6 (juin 2005) : 685. http://dx.doi.org/10.1094/pd-89-0685a.

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The polyphagous stubby-root nematode species, Paratrichodorus teres (Hooper) Siddiqi, was first described from soil under lettuce near Norwich, UK and subsequently reported from South Africa and the United States, but predominantly from temperate regions within Europe (4). P. teres is one of 13 economically important trichodorid species known to be vectors of Tobacco rattle virus (TRV) (4). Artichokes planted during 2000 in a field located in the Kandia area of the Argolis Region, Greece (37°32′N, 22°56′E) exhibited symptoms of a virus infection. Sampling was done to ascertain the presence of Longidorus fasciatus, a vector of artichoke Italian latent nepovirus known to occur in the area (1,4). In addition to L. fasciatus, an unknown trichodorid species and Tylenchorhyncus sp. were recovered from the root zone of artichoke at a number of sites within the field. Measurements and morphological examination of the female (n = 13, body length = 741.7 ± 25.5 μm, onchiostyle = 43.7 ± 0.8 μm, and position of vulva from anterior region relative to total body length V% = 53.8 ± 0.4 μm) and male (n =1, body length = 720.5 μm, onchiostyle = 43.5 μm, spicule length = 51.7 μm, and number of ventromedian precloacal supplements = 3) trichodorids isolated from soil samples conformed to the original description of P. teres and the generic polytomous key (2). Furthermore, morphological identification was supported by molecular data. DNA was extracted from seven individual trichodorids, each of which were placed into separate 0.5-ml micro-centrifuge tubes containing 20 μl of 0.25 M NaOH and incubated at 25°C overnight. Thereafter, samples were incubated at 99°C for 3 min and 10 μl of 0.25 M HCl, 5 μl of 0.5 M Tris-HCl, (pH 8.0) and 5 μl of 2% Triton X-100 were added to each tube. Samples were incubated at 99°C for a further 3 min and stored at -20°C. Template DNA was amplified using polymerase chain reaction with primers specific for 18S rDNA and sequenced (3). The resultant consensus sequence had 99.8% homology to P. teres populations isolated from Portugal and good homology (95 to 98%) with five other Paratrichodorus spp. listed on public sequence databases, e.g., NCBI GenBank. This constitutes a new geographic record and a possible association of P. teres on artichoke. References: (1) D. J. F. Brown et al. Eur. J. Plant Pathol. 103:501, 1997. (2) W. Decraemer. Fundam. Appl. Nematol. 21:37, 1998. (3) C. M. G. Oliveira et al. J. Nematol. 36:153, 2004. (4) C. E. Taylor and D. J. F. Brown. Nematode Vectors of Plant Viruses, CAB International Mycological Institute, Wallingford, UK, 1997.

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Claude Lorrain. Yale University Press/the Clark, 2007.

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