Wyniki wyszukiwania - Biblioteka Nauki

1

Removal of heavy metals from wastewater using ion exchange resin amberjet 1200H columns

100%

Bai Y. , Bartkiewicz B.

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2009

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tom z. 55

43-51

EN

The aim of this study was the removal of Cu2+, Zn2+ by ion-exchange resin Amberjet 1200H in flow condition. The adsorption characteristics of each metal onto the resin were accurately described by Freundlich isotherms. Ion exchange capacities of the heavy metals on the ion exchange resin were studied in a single metal solution. The capacities of sorption were 2.13 eq. Zn/l, and 2.74 eq. Cu/l respectively, and the ion exchange on resin follows pseudo-first-order kinetics.

PL

Celem badań była ocena skuteczności usuwania z roztworu wodnego miedzi i cynku przez wymianę jonową na kolumnie wypełnionej żywicą Amberjet 1200H. Charakterystykę usuwania każdego z metali można było opisać izotermą Freundlicha. Pojemności jonowymienne żywicy, ustalone dla każdego metalu oddzielnie wynosiły 2,13 val Zn/l i 2,74 val Cu/l. Kinetyka wymiany daje się opisać równaniem pierwszego rzędu.

2

Research and Simulation of a Full-Scale Attitude Algorithm for Strapdown Inertial Navigation Based on a Rotation Vector

80%

Cao Y. , Bai Y. , Du J. , Zhao J.

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2013

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tom R. 89, nr 3b

41--43

EN

The compensation for non-swappable error of traditional quaternion algorithm is not enough in attitude matrix solution. It can only apply to the attitude solution of low dynamic carriers. An optimized algorithm based on a 3-subsample rotation vector is presented. The full-scale attitude of a strapdown inertial navigation system can be calculated through resolving a attitude change quaternion. The algorithm is validated through simulation. The results show that the algorithm can satisfy real-time and precision requirements. The influence of direction drift on the attitude solution of the strapdown inertial navigation system is also reduced.

PL

W artykule przedstawiono zoptymalizowany algorytm kompensacji błędów w podejściu kwaternionowym w metodzie macierzy orientacji, na potrzeby systemu nawigacji bezwładnościowej typu strapdown. Określanie orientacji pełnowymiarowej odbywa się poprzez obliczeniowe rozwiązanie kwaterniona zmiany orientacji. Opracowany algorytm poddano badaniom symulacyjnym, których wyniki potwierdzają skuteczność proponowanego rozwiązania.

3

Manipulation of cellular energy reveals the relationship between ultraweak luminescence and cellular energy during senescence of strawberry (Fragaria × ananassa) fruits

71%

Guo J. , Liu H. , Bai Y. , Yan Y. , Li L.

Acta Physiologiae Plantarum

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2018

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tom 40

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nr 07

4

Morphogenesis and molecular characterization of a little known soil ciliate, Oxytricha nauplia Berger et Foissner, 1987 (Ciliophora, Sporadotrichida)

71%

Bai Y. , Li S. , Li Y. , Miao M. , Hu X.

Acta Protozoologica

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2018

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tom 57

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nr 2

5

Digital volume correlation in an environment with intensive salt-and-pepper noise and strong monotonic nonlinear distortion of light intensity

61%

Tu P. , Bai Y. , Xu W. , Dong B. , Ye S. , Yang Q. , Zhou Y.

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tom Vol. 47, nr 2

209--223

EN

Digital volume correlation is an image-based technique for internal 3D displacement and strain fields measurement or analysis widely used in the field of experimental mechanics. A widely used correlation function (criterion) of digital volume correlation is Pearson correlation function, which suffers from the problem of the acquired data being contaminated by salt-and-pepper noise and monotonic nonlinear distortion of the light intensity. In this work, a 3D correlation function called the Spearman correlation function is used to deal with those interferences. A numerical experiment shows that the performance of Spearman correlation function using integer-pixel registration in an environment with 10% salt-and-pepper noise is better than that of Spearman and Pearson correlation functions using sub-pixel registration in an environment with 1% salt-and-pepper noise. As the light intensity distortion is significant, the error of Pearson correlation function is considerable; meanwhile, the error of Spearman correlation function is small. In conclusion, Spearman correlation function is, in particular, practical and useful in digital volume correlation.

6

Biomass fraction of graminoids and forbs in N-limited alpine grasslands: N:P stoichiometry

61%

Zhang R. , Gou X. , Bai Y. , Zhao J. , Chen L. , Song X. , Wang G.

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tom Vol. 59, nr 1

105-114

EN

It is known that the dominance of graminoid species is promoted by N addition; however, there has been relatively little effort to examine the pattern induced by natural N fertility. Since nutriet use efficiency (NUE) is an important trait determining plant competitive ability, we expected that the species guild with higher NUE (lower nutrient content) may be more competitive on infertile soils. We explored the relationships between relative forbs biomass share, soil N and productivity by the linear regressi on analysis on a natural alpine meadow in northeast of Qinghai Tibetan Plateau (3600 m a.s.l.). To test the variety of leaf N:P stoichiometry, paired t test and general linear model multivariate (GLM) analysis were also used. We found that the leaf N:P ratios of the whole community were below 13 in studied sites, which may be consistent with the N limitation on the vegetation. Graminoids retained lower concentrations of leaf N and P than forbs in community on the N limited grassland. Consistent with our prediction, we found that the biomass fraction of graminoids declined with soil N content and aboveground production on the grassland. Different from the pattern along fertility gradients induced by N fertilization, our results showed that gr aminoids with lower internal nutrient content were able to resist low levels of nutrient availability on the natural alpine grassland when compared to forbs.

7

Analysis of Saussurea species from tibet using HPLC-DAD-ESI-MS n

61%

Dawa Z. , Zhou Y. , Bai Y. , Gesang S. , Liang J. , Ding L.

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tom Vol. 22, no. 1

141--152

EN

An HPLC-DAD-ESI-MS n method has been developed for simultaneous quantification of eight major compounds in eight Saussurea species which have long been used as the traditional Tibetan medicines. The method was validated for sensitivity, precision, and accuracy. LODs were from 0.11 to 5.01 μg mL -1, overall intra-day and inter-day variation was less than 2.70%, and overall recovery was over 98.0%. The correlation coefficients ( r 2) of the calibration plots were >0.991. This newly established method was successfully used to reveal difference among the chemical profiles and analytes contents of eight Saussurea species collected in Tibet. In addition, by comparison of UV and mass spectra with those of authentic compounds, a total of fifteen peaks were identified. It can be concluded that this is an effective method for quantification and evaluation of the flavonoids and coumarins in the eight species of the genus Saussurea . It can be used as an efficient reference method for development and use of the eight traditional Tibetan medicines by comparing their different characteristics.

8

mRNA expression of select hypoxia-inducible genes and apoptotic control genes in zebrafish exposed to hypoxia during development

61%

Ding Z. , Sun P. , Hua X. , Bai Y. , Shang E. H. H. , Wu R. S. S. , Zuo Y.

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nr 2

EN

Hypoxia is well known to occur in contaminated water environments, but it is still unclear about its effects on transcription of hypoxia-inducible genes and apoptotic control genes in zebrafish during development. In this study, the expression of select genes during zebrafish embryonic development was detected at mRNA level to investigate spatio-temporal changes of hypoxia-inducible genes and apoptosis control genes, as well as the correlation between these genes. Results showed that up-regulation of hypoxia-inducible factor 1 (HIF-1α) mRNA occurred within the first 2 h of exposure to hypoxia, followed by up-regulation of other hypoxia-inducible genes controlled by HIF-1α, such as erythropoietin and vascular endothelial growth factor. 48 hpf (the critical period for embryonic development, especially for the development of a cardiac system) and 40 dpf (the critical period for sex differentiation and development) were found to be the two sensitive windows to hypoxia, at which time significant changes in the mRNA expression of all selected hypoxia-inducible genes were clearly evident. A higher ratio of pro-apoptotic gene (Bax) vs. anti-apoptotic gene (Bcl-2) transcriptions was found in the head as compared with in the tail under hypoxia. A higher Bax/Bcl-2 ratio was found in hypoxic males than in hypoxic females, suggesting that hypoxia potentially favors the formation of testes by inducing apoptosis in ovaries during the hermaphroditism in zebrafish, which in turn causes a malebiased sex ratio.

9

Identification and analysis of the SAURs in Prunus sibirica

51%

Yan X. , Yi R. , Bao W. , Rula S. , Bai Y. , Chen J. , Lin Y. , Huang H. , Han D. , He Y.

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2024

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tom 91

10

Root restriction affected anthocyanin composition and up-regulated the transcription of their biosynthetic genes during berry development in ‘Summer Black’ grape

51%

Wang B. , He J. , Bai Y. , Yu X. , Li J. , Zhang C. , Xu W. , Bai X. , Cao X. , Wang S.

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2013

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tom 35

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nr 07

EN

Root restriction was applied to ‘Summer black’ grape (Vitis vinifera L. 9 Vitis labrusca L.) to investigate its effect on anthocyanin biosynthesis in grape berry during development. Anthocyanin composition and expression patterns of 16 genes in anthocyanin pathway were thus analyzed. The results showed that the anthocyanin levels in berry skin were significantly increased and the anthocyanin profile was enriched. Gene expression pattern revealed that the increased anthocyanins coincide with the up-regulated expression of all 16 genes investigated, including phenylalanine ammonia-lyase, 4-coumarate CoA ligase, chalcone synthase 1, chalcone synthase 2, chalcone synthase 3, chalcone isomerase, flavanone 3-hydroxylase 1, flavanone 3-hydroxylase 2, flavonoid 30-hydroxylase (F30H), flavonoid 30,50-hydroxylase (F3050H), di-hydroflavonol 4-reductase, leucoanthocyanidin dioxygenase, O-methyltransferases (OMT), UDP-glucose:flavonoid 3-O-glucosyltransferase (3GT), UDP-glucose:flavonoid 5-O-glucosyltransferase (5GT) and glutathione S-transferase (GST). The increased total anthocyanins predominantly resulted from the increase of tri-hydroxylated, methoxylated and monoglycosylated rather than di-hydroxylated, non-methoxylated, and di-glycosylated forms, which might be due to the differential regulation of F3050H/F30H, OMT and 3GT, respectively.