Wyniki wyszukiwania - Biblioteka Nauki

1

The regulatory role of silicon on water relations, photosynthetic gas exchange, and carboxylation activities of wheat leaves in field drought conditions

100%

Gong H. , Chen K.

Acta Physiologiae Plantarum

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2012

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tom 34

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nr 4

EN

The effects of silicon on water relations, photosynthetic gas exchange, and carboxylation activities of wheat (Triticum aestivum L.) leaves were investigated in field drought conditions. Silicon application improved the leaf relative water content and water potential under drought. The leaf net photosynthetic rate and stomatal conductance were significantly decreased between 7:30 and 17:30 under drought, whereas silicon application increased the leaf net photosynthetic rate between 7:30 and 15:30 with an exception at 9:30. Silicon application also increased the leaf stomatal conductance at 13:30 and 17:30 under drought. The leaf transpiration rate was decreased by drought but it was increased by silicon from 13:30 to 17:30. The intercellular CO₂ concentration was increased at 7:30 under drought, while it was decreased most of the time from midday to the afternoon. The leaf stomatal limitation was increased under drought from 11:30 to 17:30, whereas it was intermediate in silicon treated plants. The instantaneous water use efficiency was significantly increased by silicon application at 7:30 under drought. Silicon application slightly decreased the activity of ribulose-1, 5-bisphosphate carboxylase, but it increased the activity of phosphoenolpyruvate carboxylase and the concentration of inorganic phosphorus under drought. These results suggest that silicon could improve the photosynthetic ability of wheat in field drought conditions, and both stomatal and non-stomatal factors were involved in the regulation. In the early morning (at 7:30), the non-stomatal factor was the main contributor; 9:30 was a turning point, after which the stomatal factor was the main contributor.

2

Which influencing factors cause CO2 emissions differences in China’s provincial construction industry: empirical analysis from a quantile regression model

80%

Wang J. , Song X. , Chen K.

Polish Journal of Environmental Studies

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2020

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tom 29

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nr 1

3

Synthesis, Characterization and Activity of Rare Earth Complexes with Schiff Base from Picolinaldehyde N-Oxide and 4,4'-Methylenedianiline

80%

Yu Q. , Chen K. , Tan M. Y.

Polish Journal of Chemistry

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2003

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tom Vol. 77 / nr 7

917-921

4

Differences among influencing factors of China’s provincial energy intensity: empirical analysis from a geographically weighted regression model

80%

Wang J. , Chen K. , Song X.

Polish Journal of Environmental Studies

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2020

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tom 29

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nr 4

5

Role of macrophages in pregnancy and related complications

80%

Jena M. K. , Nayak N. , Chen K. , Nayak N. R.

Archivum Immunologiae et Therapiae Experimentalis

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2019

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tom 67

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nr 5

6

The Preparation of Soluble Cellouronic Acid Sodium Salt by 4-Acetamide-TEMPO Mediated Oxidation of Ultrasound-Pretreated Parenchyma Cellulose from Bagasse Pith

80%

Gao X. , Chen K. , Zhang H. , Peng L.

Archives of Acoustics

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2014

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tom Vol. 39, No. 2

267--275

EN

The parenchyma cellulose isolated from bagasse pith was used as an alternative resource for preparation of water-soluble cellouronic acid sodium salt (CAS). The influence of ultrasound treatment on the cellulose was investigated for obtaining CAS by regioselective oxidization using 4-acetamide-TEMPO and NaClO with NaClO2 as a primary oxidant in an aqueous buffer at pH 6.0. The yield, carboxylate content and polymerization degree (DP) of CAS were measured as a function of ultrasonic power, agitating time and cellulose consistency by an orthogonal test. The ultrasound-treated conditions were further improved by discussion of ultrasonic power, the most important factor influencing the yield and DP. An optimized CAS yield of 72.9% with DP value (DPv) of 212 was found when the ultrasonic strength is 550 W, agitating time is 3 h and cellulose consistency is 2.0%. The oxidation reactivity of cellulose was improved by ultrasonic irradiation, whereas no significant changes in crystallinity of cellulose were measured after ultrasonic treatment. Moreover, the ultrasound treatment has a greater effect on yielding CAS from parenchyma cellulose than from bagasse fibrous’ one. The CAS was further characterized by Fourier transform infrared spectroscopy (FT-IR) and Scanning electron microscopy (SEM).

7

Antioxidative system's responses in the leaves of six Caragana species dueing drought stress and recovery

80%

Kang H.-M. , Chen K. , Bai J. , Wang G.

Acta Physiologiae Plantarum

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2012

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tom 34

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nr 6

EN

For investigating the protective roles of antioxidative system in desiccation tolerance of Caragana species as they adapt to arid environments, we monitored a variety of ecophysiological parameters in the leaves of Caragana arborescens (mesophyte), C. microphylla (semiarid species), C. roborovskyi, C. stenophylla, C. acanthophylla, and C. tragacanthoides (xerophyte) grown under a drying-rehydration cycle. Relative leaf water content and chlorophyll content were decreased by 17.4–39.2 %, and by 14–40 %, respectively, after exposure to 48 days of drought stress. Malondialdehyde did not increase in xeric Caragana species. Hydrogen peroxide concentrations increased by 13.1–43.9 % except in C. acanthophylla. The activities of superoxide dismutase (SOD), guaiacol peroxidase (POD), ascorbate peroxidase (APX), glutathione reductase (GR) and reduced glutathione (GSH) in xeric Caragana species were significantly elevated with progressing drought stress. However, catalase in all species decreased markedly before drought stress treatment reached 40 days. The xeric Caragana species showed higher SOD, POD, APX, and GR activities, as well as ascorbate content, and more manganese SOD isoenzymes. C. arborescens and C. microphylla accumulated more free proline. Our data indicate that SOD and POD with the ascorbate–glutathione cycle have important protective effects in xeric Caragana species under drought stress. Free proline may be crucial in the resistance of C. arborescens and C. microphylla to drought stress.

8

Improved Data Preprocessing Algorithm for Time-Domain Induced Polarization Method with Digital Notch Filter

71%

Ge S.-C. , Deng M. , Chen K. , Li B. , Li Y.

Acta Geophysica

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2016

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tom Vol. 64, no. 6

2264--2288

EN

Time-domain induced polarization (TDIP) measurement is seriously affected by power line interference and other field noise. Moreover, existing TDIP instruments generally output only the apparent chargeability, without providing complete secondary field information. To increase the robustness of TDIP method against interference and obtain more detailed secondary field information, an improved dataprocessing algorithm is proposed here. This method includes an efficient digital notch filter which can effectively eliminate all the main components of the power line interference. Hardware model of this filter was constructed and Vhsic Hardware Description Language code for it was generated using Digital Signal Processor Builder. In addition, a time-location method was proposed to extract secondary field information in case of unexpected data loss or failure of the synchronous technologies. Finally, the validity and accuracy of the method and the notch filter were verified by using the Cole-Cole model implemented by SIMULINK software. Moreover, indoor and field tests confirmed the application effect of the algorithm in the fieldwork.

9

Loss-of-function of DELLA protein SLN1 activates GA signaling in barley aleurone

71%

Chen K. , Tian S. , Yandell B. S. , Kaeppler S. M. , An Y. Q. C.

Acta Physiologiae Plantarum

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2010

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tom 32

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nr 4

EN

Gibberellic acid (GA) is an important signaling molecule that participates in many aspects of plant growth and development. While the importance of this hormone is clear, the transcriptional regulatory networks involved are still being characterized. The cereal aleurone, particularly the barley aleurone, has been used as a classic model to study GA and GA signaling for many years, and these studies have significantly contributed to our understanding of GA in plant biology. The objective of this study was to characterize the transcripts regulated through the DELLA protein SLN1, a negative regulator of the GA signaling pathway. To detect the transcripts, Affymetrix Barley 1 GeneChips were hybridized with RNA extracted from barley aleurone treated with GA or aleurone of the DELLA mutant sln1c without GA treatment. The transcripts detected, in term of both expressed genes and their function, were highly similar between the GA-treatment and the sln1c mutant. These results from a genome-wide transcript analysis provide evidence that SLN1 in the GA signal transduction pathway controls almost all GA-induced genes in the barley aleurone.

10

Output Characteristics and MPPT Research for PV Array dunder Partially Shaded Conditions

71%

Jia L. , Chen K. , Li G. , Feng L. , Jiang X.

Przegląd Elektrotechniczny

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2013

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tom R. 89, nr 1b

279--283

EN

MPPT(maximum power point tracking) has been one of the hot issues in PV power system all the time. At present, most of MPPT methods are very efficient only under uniform irradiance. However, the output power-voltage curve presents multi-peak characteristics under PSCs (partially shaded conditions), which is one challenge of the MPPT technology. In this paper, the segment characteristics of PV array, which is made by PV modules in series-parallel (SP) connection, was analyzed in details under PSCs. And then a GMPPT (global maximum power point tracking) algorithm was proposed based on the segment model. The MPPT controller using this algorithm can rapidly locate the segment where the GMPP(Global Maximum Power Point) is in and then converges the working point to GMPP using an improved InC (Incremental Conductance) method. A Matlab/SIMULINK model verifies that the proposed algorithm is efficient under both uniform irradiance and PSCs.

PL

System śledzenia warunków maksymalnej mocy MPPT jest powszechnie stosowany w systemach fotowoltaicznych. Systemy te w większości działają w warunkach jednorodnego nasłonecznienia. W artykule zaproponowano system śledzenia mocy w warunkach częściowego nasłonecznienia.

11

The occurrence of the common European fish cestode Caryophyllaeus laticeps (Pallas, 1781) in the River Irtysh, China: a morphological characterization and molecular data

71%

Xi B. W. , Barcak D. , Oros M. , Chen K. , Xie J.

Acta Parasitologica

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2016

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tom 61

|

nr 3

12

Cloning and partial characterization of a gene in Bombyx mori homologous to a human adiponectin receptor

61%

Zhu M. , Chen K. , Wang Y. , Guo Z. , Yin H. , Yao Q. , Chen H.

Acta Biochimica Polonica

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2008

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tom 55

|

nr 2

241-249

EN

In this study, we report the cloning and characteristics of an adiponectin-like receptor gene from Bombyx mori (BmAdipoR) with highly conserved deduced amino-acid sequences and similar structure to the human adiponectin receptor (AdipoR). Structural analysis of the translated cDNA suggested it encoded a membrane protein with seven transmembrane domains. BmAdipoR was found to be expressed in multiple tissues and highly expressed in Malpighian tubules, fat body and testis. BmNPV (Bombyx morinucleopolyhedrovirus) bacmid system combined with confocal microscopy revealed that BmAdipoR was targeted to the cell membrane. We also found that infection with BmNPV did not have an effect on BmAdipoR mRNA quantity in the midgut of susceptible Bombyx moristrain (306) at 48 h, but BmAdipoR mRNA quantity increased significantly at 72 h. We concluded that BmAdipoR gene was a membrane protein ubiquitously expressed in Bombyx moritissues and that its expression was altered by treating with BmNPV.

13

Stable isotope characteristics for precipitation events and their responses to moisture and environmental changes during the summer monsoon period in Southwestern China

61%

Xia C. , Liu G. , Chen K. , Hu Y. , Zhou J. , Liu Y. , Mei Y.

Polish Journal of Environmental Studies

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2020

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tom 29

|

nr 3

14

HBx and SP1 upregulate DKK1 expression

61%

Peng H. , Li Y. , Liu Y. , Zhang J. , Chen K. , Huangand A. , Tang H.

Acta Biochimica Polonica

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2017

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tom 64

|

nr 1

15

Characterization of recombinant expression of Bombyx mori bidensovirus ns1 using a modified vector

61%

Li G. , Li M. , Wang P. , Hu Z. , Yao Q. , Tang Q. , Chen K.

Acta Biochimica Polonica

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2014

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tom 61

|

nr 4

16

Expression profile of genes involved in ramie flavonoids biosynthesis pathway and regulation of flavanone 3-hydroxylase (BnF3H) in response to aquatic environment

61%

Gao G. , Chen P. , Chen J. , Chen K. , Xiong H. , Yu C. , Zhu A.

Acta Physiologiae Plantarum

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2020

|

tom 42

|

nr 04

17

Molecular cloning, expression and characterization of Bmserpin-2 gene from Bombyx mori

51%

Pan Y. , Xia H. , Lu P. , Chen K. , Yao Q. , Chen H. , Gao L. , He Y. , Wang L.

Acta Biochimica Polonica

|

2009

|

tom 56

|

nr 4

671-677

EN

Serpins are a broadly distributed family of protease inhibitors. In this study, the gene encoding Bombyx mori serpin-2 (Bmserpin-2) was cloned and expressed in E. coli. The Bmserpin-2 cDNA contains a 1125 bp open reading frame (ORF). The deduced protein has 374 amino-acid residues, contains a conserved SERPIN domain and shares extensive homology with other invertebrate serpins. RT-PCR analysis showed that Bmserpin-2 was expressed in all developmental stages of B. mori larvae and various larval tissues. Subcellular localization analysis indicated that Bmserpin-2 protein was located in the cytoplasm. Interestingly, real-time quantitative PCR revealed that the expression of Bmserpin-2 in the midgut of susceptible B. mori strain 306 significantly increased at 72 hours post inoculation (hpi) when infected with BmNPV. However, there was no significant increase of the Bmserpin-2 expression in resistant strain NB infected with BmNPV. Thus, our data indicates that Bmserpin-2 may be involved in B. mori antiviral response.

18

Expression of COX-2 and Bcl-2 in primary fallopian tube carcinoma: correlations with clinicopathologic features

51%

Wang F. , Sun G.-P. , Zou Y.-F. , Wu Q. , Wu H.-Y. , Wu J.-F. , Zhou J.-D. , Chen K. , Zhang X.-Z.

Folia Histochemica et Cytobiologica

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2011

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tom 49

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nr 3