Труды сотрудников ИЛ им. В.Н. Сукачева СО РАН

[Text] / T. T. Efremova, T. M. Ovchinnikova // Eurasian Soil Sci. - 2007. - Vol. 40, Is. 12. - P1298-1307, DOI 10.1134/S106422930712006X. - Cited References: 11 . - 10. - ISSN 1064-2293РУБ Soil Science

Аннотация: The specificity of the group and fraction composition of the organic matter in peat soils drained to a different extent that have developed for a 20-to 25-year period of hydro-and forest amelioration was characterized using the methods of multidimensional statistics. The differences in the organic matter of the soils studied are mainly determined by the contents of humic and fulvic acid of fractions 1 and 3, as well as of hemicelluloses and cellulose. The degree and depth of the humification are inversely related to the soil moisture and directly related to the peroxidase activity.

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Держатели документа:
[Efremova, T. T.
Ovchinnikova, T. M.] Russian Acad Sci, Sukachev Inst Forestry, Siberian Branch, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Efremova, T.T.; Ovchinnikova, T.M.

[Text] / G. F. Antonova, I. A. Chapligina ; ed.: R Lagana, S Kurjatko, , S Kurjat // WOOD STRUCTURE AND PROPERTIES' 06 : ARBORA PUBLISHERS, 2006. - 5th International Symposium Wood Structure and Properties (SEP 03-06, 2006, Sliac Siehnica, SLOVAKIA). - P25-31. - Cited References: 22 . - 7. - ISBN 978-80-968869-4-4РУБ Materials Science, Paper & Wood

Аннотация: The deposition of cellulose, matrix polysaccharides and lignin during secondary cell wall development of early- and latewood in larch (Larix sibirica Ldb.) were studied using biochemical and histochemical methods. Active tissues at successive stages of secondary cell wall development were sampled from larch trunk and characterized by morphological parameters and the content of cellulose, lignin and matrix hemicelluloses, being the structural base for lignification. Matrix polysaccharides were divided by their solubility in 4 % and 24 % KOH and neutral medium. All data were accounted per dry weight and per cell. The amount of biomass (as cell wall cross-section area) deposited before lignification was more in earlywood tracheids than in latewood ones. In contrast. the amount of cellulose at this stage was more in latewood tracheids. The intensity of cellulose synthesis was the highest at the initial stage of lignin deposition in both earlywood and latewood and then declined towards to mature xylem. The intensity of lignin deposition was the highest at the last stage of secondary cell wall development during earlywood formation and from the outset of latewood lignification, dropping towards mature xylem. The contents of A and B hemicellulose fractions linked or not with cellulose, before and after beginning of lignification were different during earlywood and latewood formation. Before lignin deposition, the content of B-4 fraction in both earlywood and latewood was practically equal as well as of B-24, while the amount of A-4 fraction before lignification of early xylem was two times more than that of latewood. This shows different matrix base for the beginning of lignification. All together can be the reason for different physicochemical properties of two types of wood in larch.

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Держатели документа:
Russian Acad Siences, SB, VN Sukachev Inst Forest, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Antonova, G.F.; Chapligina, I.A.; Lagana, R \ed.\; Kurjatko, S \ed.\; Kurjat, , S \ed.\

/ E. A. Tyutkova [et al.] // J. Therm. Anal. Calorim. - 2017. - Vol. 130, Is. 3. - P1391-1397, DOI 10.1007/s10973-017-6550-7. - Cited References:33 . - ISSN 1388-6150. - ISSN 1588-2926РУБ Thermodynamics + Chemistry, Analytical + Chemistry, Physical

Аннотация: This paper deals with the results of a study of the thermodestruction of the earlywood and latewood in the 1988-1998 growth rings of Gmelin larch (Larix gmelinii (Rupr.) Rupr.) trees growing along the polar tree line (70(A)52'53aEuro(3)N, 102A degrees 58'26aEuro(3)E, Taimyr Peninsula). The study used methods of thermogravimetry (TG/DTG) and differential scanning calorimetry (DSC). Thermogravimetric data obtained were analyzed by Ozawa-Flynn-Wall kinetic model. We determined macrokinetic parameters of thermodestruction. Earlywood and latewood showed no significant difference in cellulose/hemicellulose/lignin ratio, whereas they differed significantly in destruction average value of activation energy (197.55 and 55.90 kJ mol(-1), respectively). Our analysis of the correlation of thermodestruction values with mean monthly air temperature and precipitation revealed that component composition of both earlywood and latewood was influenced more by the weather conditions at the beginning of the growing season (April-June). Air temperature had markable influence on the wood component composition during cell wall synthesis only in latewood, whereas precipitation influenced the composition in both latewood and earlywood. TG/DTG and DSC methods were found to be promising for developing information on biochemical composition of early and latewood tracheids in stems and for identifying the extent of the influence of climatic changes on cell wall synthesis.

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Russian Acad Sci, Siberian Branch, Forest Inst, Lab Phys & Chem Biol Woody Plants, Akad Dorodork 50-28, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Siberian Branch, Forest Inst, Dendroecol Dept,Lab Tree Ring Struct, Krasnoyarsk, Russia.

Доп.точки доступа:
Tyutkova, E. A.; Loskutov, S. R.; Shashkin, A. V.; Benkova, V. E.

/ G. F. Antonova [et al.] // Wood Sci Technol. - 2019. - Vol. 53, Is. 4. - P927-952, DOI 10.1007/s00226-019-01108-w . - ISSN 0043-7719
Аннотация: Lignification of earlywood and latewood during annual ring formation in Scots pine stem in the season occurs with opposite dynamics. The subject of this study was to examine the structure of lignin deposited at successive stages of secondary cell wall maturation of these two wood types. Lignin specimens derived from developing cells by the thioglycolic acid were analyzed by the methods of alkaline oxidation, alkaline and acid hydrolysis and IR Fourier spectroscopy. The composition of lignin structural subunits was found to change at each stage of lignification in dependence of the forming wood type. The molar ratio of p-hydroxyphenyl, guaiacyl and syringyl subunits in polymer was modified in earlywood and latewood oppositely. In the course of earlywood cell maturation, syringyl subunits in lignin increased in parallel with p-hydroxyphenyl units. During latewood lignification, syringyl and p-hydroxyphenyl subunits in lignin structure decreased, whereas guaiacyl subunits increased as secondary cell wall maturation. In lignin isolated from both wood types, the ether-bound carbohydrates were more than by an order of magnitude of ester-bound carbohydrates. In early xylem, the content of ether-bound carbohydrates practically did not change during lignin deposition, whereas carbohydrates with ester linkages gradually decreased toward mature xylem. Lignification in latewood was accompanied by the decline of both ester-linked and ether-linked carbohydrates with a sharp increase in the latter in mature xylem. Hemicelluloses, included in such bonds, contained mainly the residues of xylose and arabinose. The composition and the content of hydroxycinnamic acids, taking part in these linkages, also changed in dependence of lignification steps and wood type. The data received are in agreement with the alterations in absorption IR spectra of lignins isolated from the cells at the beginning of lignification and mature xylem. The reasons for the differences in the lignin structure during earlywood and latewood development are discussed. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.

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VN Sukachev Institute of Forest, SB RAS Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Institute of Solid State Physics RAS, 2 Academician Ossipyan Str., Chernogolovka, Moscow District, 142432, Russian Federation

Доп.точки доступа:
Antonova, G. F.; Varaksina, T. N.; Zheleznichenko, T. V.; Bazhenov, A. V.

/ O. Shapchenkova, S. Loskutov, A. Aniskina [et al.] // Eur. J. Wood Wood Prod. - 2021, DOI 10.1007/s00107-021-01763-6. - Cited References:56. - The work was carried out as part of GINOP-2.3.315-2016-00038, "Further processing of wood and wood products based on green chemistry and technology, through creating modern research infrastructure" in the framework of the Szechenyi 2020 Program. The implementation of this project is supported by the European Union, co-financed by the European Regional Development Fund. . - Article in press. - ISSN 0018-3768. - ISSN 1436-736XРУБ Forestry + Materials Science, Paper & Wood

Аннотация: This paper presents a thermal characterization of hardwoods of Hungarian origin. The study covers the wood of the following tree species: sessile oak (Quercus petraea), beech (Fagus sylvatica), hornbeam (Carpinus betulus), black locust (Robiniapseudoacacia), lime (Tilia platyphyllos), ash (Fraxinus ornus), maple (Acer campestre), alder (Alnus glutinosa), and aspen (Populus tremula). Wood samples were subjected to differential scanning calorimetry and thermogravimetry in an air atmosphere at different heating rates of 10, 20, and 40 degrees C center dot min(-1). The activation energy was calculated using the Flynn-Wall-Ozawa method. Thermogravimetric analysis revealed that tree species differed considerably in the mass loss and the temperature of the maximum mass loss rate related to the thermal degradation of the main wood components and the oxidation of char mainly derived from lignin. Beech, hornbeam and ash were characterized by a high mass loss attributed to decomposition of hemicelluloses. The mass loss assigned to the thermal degradation of cellulose varied from 35.41% (ash wood) to 53.65% (alder wood). Sessile oak wood showed the greatest mass loss and the highest temperature of thermoxidation of residual lignin and char. Calorimetrically measured values of the exothermic effect of the wood thermal degradation were in the range 7.93-9.65 kJ g(-1). The average values of activation energy for the thermal degradation of carbohydrates and the thermoxidation of residual lignin and char were found to be 176.0 divided by 197.3 kJ mol(-1)and 196.4 divided by 319.5 kJ mol(-1), respectively.

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Держатели документа:
Krasnoyarsk Sci Ctr SB RAS, VN Sukachev Inst Forest SB RAS, Fed Res Ctr, Krasnoyarsk, Russia.
Univ Sopron, Sopron, Hungary.

Доп.точки доступа:
Shapchenkova, Olga; Loskutov, Sergei; Aniskina, Antonina; Borcsok, Zoltan; Pasztory, Zoltan; Szechenyi 2020 Program [GINOP-2.3.315-2016-00038]; European UnionEuropean Commission; European Regional Development FundEuropean Commission