Wyniki wyszukiwania - Biblioteka Nauki

1

MAIGO2 is involved in gibberellic acid, sugar, and heat shock responses during germination and seedling development in Arabidopsis

100%

Zhao P. , Lu J.

Acta Physiologiae Plantarum

|

2014

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tom 36

|

nr 02

EN

Our previous study has shown that MAIGO2 (MAG2) is a subunit of the Golgi/endoplasmic reticulum (ER) multi-subunit tethering complex, and is required for tolerance to general osmotic stresses and abscisic acid and response to ER stress during seed germination and early growth. MAG2 is crucial for multi-environmental stress responses. To verify this hypothesis, the response of mag2 mutants to gibberellic acid (GA), sugar, and heat shock was described in this study. The mag2 mutants showed defects during seed germination and early seedling development under treatments with the GA biosynthesis inhibitor paclobutrazol, sucrose, and glucose. MAG2 is also essential for basal thermotolerance. However, the MAG2 homolog (MAG2L) is not necessary for these responses. MAG2 is an important regulator in the response to multi-environmental stimuli, supposedly through its roles in Golgi/ER retrograde trafficking and ER stress response.

2

Technical application of petroleum logging instruments in marine logging

80%

Gu G. , Zhao P. , Wang L. , Guo H.

Polish Maritime Research

|

2018

|

tom S 3

22--28

EN

To solve the problem of offshore oilfield development, based on the newly introduced pulsed neutron oxygen activation logging instrument, the application research of test design and interpretation method was carried out and applied to actual production. The structure, technical indicators and logging principles of pulsed neutron oxygen activation logging tools were introduced. The test design under different well conditions was studied, including general positive and negative injection, oil sleeve injection, single oil pipe configuration and multitubing configuration. A large amount of field test data was collected and analysed technically. A set of effective interpretation models was proposed. The corresponding interpretation software was developed. A set of test design methods and operating specifications for different well conditions were developed. Based on the conventional interpretation method, the peak selection, the double-tuber peak identification and the carbon dioxide flooding interpretation method were added. The results show that the test design and interpretation methods were applied well through a large number of field tests and production applications. Therefore, pulsed neutron oxygen activated injection profile logging technology is successfully applied in offshore oil fields.

3

Experimental and Theoretical Study on 3-Benzyl-4-phenyl-1,2,4-triazole-5-thione

80%

Zhao P. , Li R. , Xu J. , Zhang W.

Polish Journal of Chemistry

|

2007

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tom Vol. 81, nr 8

1495-1503

EN

The 3-benzyl-4-phenyl-1,2,4-triazole-5-thione was synthesized and examined by elementary analysis, IR and electronic spectra. Density functional theory calculations of the structure, natural bond orbitals and thermodynamic functions of the title compound were performed at B3LYP/6-311G** level of theory. Vibrational frequencies were predicted, assigned and compared with the experimental data, and they are supported by the experimental data. Electronic absorption spectrawere calculated by the time-dependent density functional theory (TD-DFT), which indicates that the two absorption bands are mainly derived from the contribution of bands *. The calculation of the second order optical nonlinearity was carried out, giving value of molecular hyperpolarizability equal to 4.025ź10–30 esu. These calculated results were also compared with results obtained for a similar molecule, 4-phenyl-3-[(1,2,4-triazol-1-yl)methyl]-triazole-5-thione, reported earlier by this group.

4

Experimental and Density Functional Studies on Two Substituted 1H-Benzimidazoles

80%

Zhao P. , Yu H. , Jian F. , Wang X.

Polish Journal of Chemistry

|

2007

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tom Vol. 81, nr 8

1511-1519

EN

Two substituted 1H-benzimidazoles, 2-(4-chlorophenyl)-1H-benzimidazole and 1-(2- chlorobenzyl)-2-(2-chlorophenyl)-1H-benzimidazole, have been synthesized and characterized by elemental analysis, IR and UV-Vis spectra. An extended MO calculations using density functional theory (DFT) at B3LYP/6-311G** level have been carried out on the two compounds. Comparison of the experiments with the calculated results suggests that the optimized geometries can well reproduce the molecular structures. Atomic charge distributions show that both of the title compounds are potential ligands to coordinate with metallic ions. Natural population analyses indicate that the electronic transitions corresponding to electronic spectra are mainly derived from the contribution of bands pi--pi*. Thermodynamic properties of the two title compounds at different temperatures have also been calculated on the basis of vibration analyses.

5

Technical application of petroleum logging instruments in marine logging

80%

Gu C. , Zhao P. , Wang L. , Guo H.

Polish Maritime Research

|

2018

|

tom 25

|

nr Special Issue S3

EN

To solve the problem of offshore oilfield development, based on the newly introduced pulsed neutron oxygen activation logging instrument, the application research of test design and interpretation method was carried out and applied to actual production. The structure, technical indicators and logging principles of pulsed neutron oxygen activation logging tools were introduced. The test design under different well conditions was studied, including general positive and negative injection, oil sleeve injection, single oil pipe configuration and multi-tubing configuration. A large amount of field test data was collected and analysed technically. A set of effective interpretation models was proposed. The corresponding interpretation software was developed. A set of test design methods and operating specifications for different well conditions were developed. Based on the conventional interpretation method, the peak selection, the double-tuber peak identification and the carbon dioxide f looding interpretation method were added. The results show that the test design and interpretation methods were applied well through a large number of field tests and production applications. Therefore, pulsed neutron oxygen activated injection profile logging technology is successfully applied in offshore oil fields

6

Experimental and Theoretical Study on4-Phenyl-3-[(1,2,4-triazol-1-yl)methyl]-triazole-5-thione

80%

Jian F. , Zhao P. , Bai Z. , Cai Z.

Polish Journal of Chemistry

|

2006

|

tom Vol. 80, nr 2

325-333

EN

The title compound, 4-phenyl-3-[(1,2,4-triazol-1-yl)methyl]-triazole-5-thione, was synthesized and characterized by elemental analysis, IR and electronic spectra. Density functional theory calculations of the structure, natural bond orbital and thermodynamic functions of the title compound were performed at B3LYP/6-311G** level of theory. Vibrational frequencies were predicted, assigned, compared with the experimental values, and they are supported each other. Electronic absorption spectra were calculated by the time-dependent density functional theory (TD-DFT), which indicates that the two absorption bands aremainly derived from the contribution of bands pi--pi*. The calculation of the second order optical nonlinearity was carried out with PM3 semi-empirical method that resulted in the molecular hyperpolarizability equal to 4.397x10-30 esu.

7

Performance of soil particle-size distribution models for describing deposited soils adjacent to constructed dams in the China Loess Plateau

80%

Zhao P. , Shao M. , Horton R.

Acta Geophysica

|

2011

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tom Vol. 59, no. 1

124-138

EN

Soil particle-size distributions (PSD) have been used to estimate soil hydraulic properties. Various parametric PSD models have been proposed to describe the soil PSD from sparse experimental data. It is important to determine which PSD model best represents specific soils. Fourteen PSD models were examined in order to determine the best model for representing the deposited soils adjacent to dams in the China Loess Plateau; these were: Skaggs (S-1, S-2, and S-3), fractal (FR), Jaky (J), Lima and Silva (LS), Morgan (M), Gompertz (G), logarithm (L), exponential (E), log-exponential (LE), Weibull (W), van Genuchten type (VG) as well as Fredlund (F) models. Four-hundred and eighty samples were obtained from soils deposited in the Liudaogou catchment. The coefficient of determination (R2), the Akaike’s information criterion (AIC), and the modified AIC (mAIC) were used. Based upon R2 and AIC, the three- and four-parameter models were both good at describing the PSDs of deposited soils, and the LE, FR, and E models were the poorest. However, the mAIC in conjunction with R2 and AIC results indicated that the W model was optimum for describing PSD of the deposited soils for emphasizing the effect of parameter number. This analysis was also helpful for finding out which model is the best one. Our results are applicable to the China Loess Plateau.

8

Experimental Studies on Isonicotinato Zinc(II) Complex [Zn(C6H4NO2)2(H2O)4] and Density Functional Calculations

80%

Zhao P. , Jian F. , Li C.

Polish Journal of Chemistry

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2005

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tom Vol. 79 / nr 6

1041-1046

EN

Isonicotinato zinc(II) complex [Zn(C6H4NO2)2(H2O)4] has been synthesized by hydrothermal method and characterized by elemental analysis, electronic-spectra and thermogravimetric analysis. Density functional theory (DFT) method calculations of the structure, atomic charges distribution, electronic spectra, natural population analysis and the thermodynamic properties at different temperatures have been performed. The calculated results show the electronic transitions are mainly derived from the contribution of pi--pi* bands and the decomposition of the title compound should firstly occur at the bond of Zn-O, then at the bond of Zn-N, which agrees very well with the experimental data.

9

Evaluation and improvement of spectrophotometric assays of TTC reduction: maize (Zea mays) embryo as an example

80%

Zhao P. , Zhu Y. , Wang W.

Acta Physiologiae Plantarum

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2010

|

tom 32

|

nr 4

EN

The triphenyl tetrazolium chloride (TTC) reduction assay was evaluated and improved with maize seed (Zea mays cv. Zhengdan958). The reduced TTC in embryo was extracted with three kinds of organic solvents: trichloroacetic acid (TCA)/acetone, ethanol, and acetone. The absorbance spectra of the three extracts were similar, with a maximum at 485 nm. The efficiency of TCA/acetone in extracting the reduced TTC was higher than that of acetone and ethanol. A negative correlation between TTC reduction and malondialdehyde content in embryo was demonstrated. The TCA/acetone extraction may be used as a routine protocol for TTC reduction assay of seed vigor in cereal (e.g. maize, rice, wheat and barley) seeds.

10

Density Functional Calculations on a Double Hydrogen Bonded Dimer of (p-Methoxyphenyl)thiosemicarbazide

80%

Zhao P. , Li R. , Zhang L. , Jian F.

Polish Journal of Chemistry

|

2006

|

tom Vol. 80, nr 12

2031-2039

EN

Density functional theory (DFT) calculations on a double hydrogen-bonded dimer of (p-methoxyphenyl)thiosemicarbazide were carried out at B3LYP/6-31G* level. The optimized geometry of the dimer closely resembles that in the crystal. The calculated results show that the total energy of the dimer is much lower than the sum of energies of the two monomers, and the average strength of the double hydrogen bond is about 21.92 kJ/mol. In order to probe the origin of the interactions in the dimer, natural bond orbital analyses have been performed. The thermodynamic properties of the title compound at different temperatures have also been calculated on the basis of vibrational analyses and the change of Gibbs free energy for dimerization of the twomonomers.GT = –18.40 kJ/mol at 298.15 K and 0.1MPa, which implies the spontaneous process of the dimer formation. The correlation graphs of Sm 0, Hm 0 and temperatures for the dimer are depicted.

11

Practical stability in terms of two measures for hybrid dynamic systems

80%

Sun S. , Han Z. , Akin-Bohner E. , Zhao P.

Bulletin of the Polish Academy of Sciences. Mathematics

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2010

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tom Vol. 58, no 3

221-237

EN

We study hybrid dynamic systems on time scales. Using Lyapunov-like functions, we obtain sufficient conditions for practical stability and strict practical stability in terms of two measures for hybrid dynamic systems on time scales.

12

Crystal Structure and Ab Initio Studies on (p-Methoxyphenyl)thiosemicarbazide

80%

Zhao P. , Jian F. , Hou Y.

Polish Journal of Chemistry

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2004

|

tom Vol. 78 / nr 10

1945-1951

EN

(p-Methoxyphenyl)thiosemicarbazide [CH3OC6H4NHNHCSNH2] has been prepared and characterized by elemental analysis, IR, electronic absorption spectra and X-ray single crystal diffraction. In the crystal lattice, there exist some intermolecular hydrogen bonds, _-_ stacking interactions and C-Hźźź_ supramolecule interactions, which stabilize the crystal structure. Ab initio calculations at HF/6-31G* level of the structure, charges distribution, electronic spectra, natural population analysis and thermodynamic properties at different temperatures have been performed. The calculated results show that the sulfur atom and nitrogen atoms have bigger negative charges, which result in they are the potential sites to react with the metallic ions. The electronic transitions associated with the electronic absorption spectra are mainly derived from the contribution of bands pi-pi*.

13

Crystal Structure, Infrared Spectra and Density Functional Theory Study on 2,3-Diketo-benzopiperazine Dimer

80%

Zhao P. , Jian F. F. , Xiao H. , Sun P.

Polish Journal of Chemistry

|

2004

|

tom Vol. 78 / nr 10

1935-1944

EN

2,3-Diketo-benzopiperazine, which exists as dimeric form in its crystal structure has been synthesized. The calculated results on the dimer at B3LYP/6-31G* level show that the average strength of the double hydrogen bonds is of medium-grade. Natural bond orbital analyses have been performed. The predicted harmonic vibration frequencies support the experimental values. The thermodynamic properties of the dimer at different temperatures have been calculated and the change of Gibbs free energy for the aggregation from the monomer to the dimerDelta GT = -30.86 kJ/mol at 298.15 K, which implies the spontaneous process of the dimer formation.

14

The discovery of the genus Irantha Stal, 1861 [Heteroptera: Reduviidae: Harpactorinae] from China, with the description of a new species

80%

Chen W. , Zhao P. , Cai W.

Annales Zoologici

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2005

|

tom 55

|

nr 1

EN

A new species, Irantha nigrina, is described in the subfamily Harpactorinae based on the specimen from China. The dorsal habitus, head, prothorax and other diagnostic morphological features are illustrated. The genus is reported for the first time to China. The reviewed diagnostic characters of the genus are presented.

15

The impact of changes in pore structure on the compressive strength of sulphoaluminate cement concrete at high temperature

71%

Tchekwagep J. J. K. , Zhao P. , Wang S. , Huang S. , Cheng X.

Materials Science Poland

|

2021

|

tom Vol. 39, No. 1

75--85

EN

The internal pore structure of sulphoaluminate cement concrete (SACC) significantly affects its mechanical properties. The main purpose of this study was to establish the relationship between pore structure changes and compressive strength after exposure to elevated temperatures. SACC samples that had been cured for 12 months were dried to a constant weight and then exposed to different temperatures (100 °C, 200 °C and 300 °C), after which the compressive strength and pore structure were measured. The pore structure of SACC was quantitatively described by mercury intrusion porosimetry (MIP) and nitrogen adsorption results. The results showed that with increased temperature, the porosity of the SACC samples also increased and the pore structure was gradually destroyed. Moreover, the SACC’s compressive strength gradually decreased with increasing temperature. The relationship between compressive strength and porosity was in close agreement with the compressive strength–porosity equation proposed by Schiller. Therefore, after extensive exposure to elevated temperature, the changes in SACC’s compressive strength can be quantitatively described by the Schiller equation.

16

A 2-bit polymer waveguide delay device using right-angle X junctions

71%

Yi Y. , Wang Q. , Zhao P. , Wang F. , Zhang D.

Optica Applicata

|

2012

|

tom Vol. 42, nr 1

111--120

EN

A 2-bit polymer waveguide delay device composed of right-angle junctions, Mach-Zehnder thermo-optic switches and bending polymer waveguides is demonstrated. The four path device and Mach-Zehnder thermo-optic switch are fabricated using direct ultraviolet photolithography process. The fabrication procedures are demonstrated. The loss of bending waveguides, right-angle X junctions and Mach-Zehnder thermo-optic switches is calculated and analyzed. The near-infrared field guided-mode patterns of the device are obtained. Time delays of the 2-bit device are measured to be 0, 121.1, 242.3, and 365.7 ps.

17

Proteomic identification of differentially expressed proteins in mature and germinated maize pollen

61%

Zhu Y. , Zhao P. , Wu X. , Wang W. , Scali M. , Cresti M.

Acta Physiologiae Plantarum

|

2011

|

tom 33

|

nr 4

EN

The identification of proteins involved in pollen germination and tube growth is important for fundamental studies of fertility and reproduction in flowering plants. We used 2-DE and MALDI-TOF-MS to identify differentially expressed proteins in mature (P0) and 1-h germinated (P1) maize pollen. Among about 470 proteins separated in 2D gels, the abundances of 26 protein spots changed (up- or down-regulation) between P0 and P1. The 13 up-regulated protein spots were mainly involved in tube wall modification, actin cytoskeleton organization, energy metabolism, signaling, protein folding and degradation. In particular, pectin methylesterase, inorganic pyrophosphatase, glucose-1-phosphate uridylyltransferase and rab GDP dissociation inhibitor α are highly up-regulated, suggesting their potential role in pollen tube growth. The down-regulated 13 protein spots mainly include defense-related proteins, pollen allergens and some metabolic enzymes. This study would contribute to the understanding of the changes in protein expression associated with pollen tube development.

18

Development of digastric muscles in human foetuses: a review and findings in the flexor digitorum superficialis muscle

61%

Rodriguez-Vazquez J. F. , Jin Z. W. , Zhao P. , Murakami G. , Li X. W. , Jin Y.

Folia Morphologica

|

2018

|

tom 77

|

nr 2

EN

The digastricus and omohyoideus muscles are digastric muscles with two muscle bellies. An insertion tendon of the posterior belly becomes an intermediate tendon in digastricus muscles, whereas a single band-like muscle in omohyoideus muscles may later be interrupted by an intermediate tendon, possibly due to muscle cell death caused by mechanical stress. In human foetuses, an intermediate tendon provides the temporal origins of the tensor veli palatini and tensor tympani muscles. Some reptiles, including snakes, carry multiple series of digastric-like axial muscles, in which each intersegmental septum is likely to become an intermediate tendon. These findings indicate that many pathways are involved in the development of digastric muscles. A review of these morphologies suggested that the flexor digitorum superficialis (FDS) muscle was a digastric muscle, although the intermediate tendon may not be visible in the surface view in adults. The present observations support the hypothesis that the proximal anlage at the elbow develops into a deep muscle slip to a limited finger, while the distal anlage at the wrist develops into the other slips. The findings suggest that, in the FDS muscle, the proximal and distal bellies of the embryonic digastric muscle fuse together to form a laminar structure, in which muscle slips accumulate from the palmar to the deep side of the forearm. (Folia Morphol 2018; 77, 2: 362–370)

19

Differences in foetal topographical anatomy between insertion sites of the iliopsoas and gluteus medius muscles into the proximal femur: a consideration of femoral torsion

61%

Zhao P. , Jin Z. W. , Kim J. H. , Abe H. , Murakami G. , Rodriguez-Vazquez J. F.

Folia Morphologica

|

2019

|

tom 78

|

nr 2

EN

Background: Prenatal twisting of the femoral neck seems to result in an angle of anteversion or torsion, but the underlying process has not been elucidated. Materials and methods: This study analysed sagittal, frontal and horizontal sections of 34 embryo and foetal specimens of gestational age (GA) 6–16 weeks (crown-rump length 21–130 mm). At GA 6–7 weeks, the iliopsoas (IP) and gluteus medius (GME) muscles were inserted into the anterior and posterior aspects of the femur, respectively, allowing both insertions to be viewed in a single sagittal section. Results: At GA 8 weeks, the greater trochanter and the femoral neck angle became evident, and the GME tendon was inserted into the upper tip of the trochanter. At GA 9 weeks, the location of IP insertion was to the medial side of the GME insertion. After 9 weeks, the IP insertion consisted of a wavy, tendinous part of the psoas muscle and another part of the iliacus muscle, with many fibres of the latter muscle attached to the joint capsule. After GA 12 weeks, the IP was inserted into the anteromedial side of the greater trochanter, while the aponeurotic insertion of the GME wrapped around the trochanter. At GA 15–16 weeks, a deep flexion at the hip joint caused an alteration in the relative heights of the lesser and greater trochanter, with the former migrating from the inferior to the slightly superior side. Conclusions: These findings indicate that twisting of the femoral neck started at GA 8–9 weeks. (Folia Morphol 2019; 78, 2: 408–418)

20

AtSec20 is involved in osmotic stress tolerance and AtSec20 mutation unaffects the integrity of intracellular organelles and the anterograde biosynthetic trafficking

61%

Zhao P. , Liu F. , Wang B. , Yu G. , Jia P. , Liu H.

Acta Physiologiae Plantarum

|

2013

|

tom 35

|

nr 05

EN

The soluble N-ethylmaleimide-sensitive factor attachment protein receptors (SNAREs) play essential roles in intracellular trafficking. However, few experimental data have clarified their roles in the stress responses and the early secretary pathway in Arabidopsis. The AtSec20 gene encodes a protein that is homologous to yeast Sec20p and mammalian BNIP1, which are involved in the Golgi-to-ER retrograde trafficking in yeast and mammalian cells. In this study, AtSec20 is found to be required for the responses to salt stress, osmotic stress and gibberellin (GA) during seed germination and early seedling establishment. Mutation of AtSec20 unaffects the morphology of intracellular organelles, such as endoplasmic reticulum (ER), trans-Golgi network, and peroxisome, and vacuolar protein trafficking is normal in sec20 mutants. Collectively, these results imply that the AtSec20 is involved in abiotic stress tolerance, potentially via roles in retrograde vesicle fusion process in Arabidopsis.