Modern Hydromorphism of Solonetzes in the Forest-Steppe Zone of Western Siberia     

Elizarov  N. V.  Popov  V. V.  Semendyaeva  N. V. 《Eurasian Soil Science》2020,53(12):1701-1708

Eurasian Soil Science - Soil salinization and alkalization is an acute problem in Western Siberia because of the rise of saline groundwater above the critical level. We studied modern hydromorphism...  相似文献   

Deep-Sea Anemones Are Prospective Source of New Antimicrobial and Cytotoxic Compounds     

Aleksandra Kvetkina  Elena Kostina  Irina Gladkikh  Victoria Chausova  Ekaterina Yurchenko  Irina Bakunina  Mikhail Pivkin  Stanislav Anastyuk  Roman Popov  Margarita Monastyrnaya  Emma Kozlovskaya  Marina Isaeva  Pavel Dmitrenok  Elena Leychenko 《Marine drugs》2021,19(12)

The peculiarities of the survival and adaptation of deep-sea organisms raise interest in the study of their metabolites as promising drugs. In this work, the hemolytic, cytotoxic, antimicrobial, and enzyme-inhibitory activities of tentacle extracts from five species of sea anemones (Cnidaria, orders Actiniaria and Corallimorpharia) collected near the Kuril and Commander Islands of the Far East of Russia were evaluated for the first time. The extracts of Liponema brevicorne and Actinostola callosa demonstrated maximal hemolytic activity, while high cytotoxic activity against murine splenocytes and Ehrlich carcinoma cells was found in the extract of Actinostola faeculenta. The extracts of Corallimorphus cf. pilatus demonstrated the greatest activity against Ehrlich carcinoma cells but were not toxic to mouse spleen cells. Sea anemones C. cf. pilatus and Stomphia coccinea are promising sources of antimicrobial and antifungal compounds, being active against Gram-positive bacteria Bacillus subtilis, Staphylococcus aureus, and yeast Candida albicans. Moreover, all sea anemones contain α-galactosidase inhibitors. Peptide mass fingerprinting of L. brevicorne and C. cf. pilatus extracts provided a wide range of peptides, predominantly with molecular masses of 4000–5900 Da, which may belong to a known or new structural class of toxins. The obtained data allow concluding that deep-sea anemones are a promising source of compounds for drug discovery.  相似文献   

A new index for rainfall erosivity on a physical basis     

Yuri P. Sukhanovski  Gregor Ollesch  Konstantin Y. Khan  Ralph Meißner 《植物养料与土壤学杂志》2002,165(1):51-57

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New Tripeptide Derivatives Asperripeptides A–C from Vietnamese Mangrove-Derived Fungus Aspergillus terreus LM.5.2     

Elena V. Girich  Anton B. Rasin  Roman S. Popov  Ekaterina A. Yurchenko  Ekaterina A. Chingizova  Phan Thi Hoai Trinh  Ngo Thi Duy Ngoc  Mikhail V. Pivkin  Olesya I. Zhuravleva  Anton N. Yurchenko 《Marine drugs》2022,20(1)

Three new tripeptide derivatives asterripeptides A–C (1–3) were isolated from Vietnamese mangrove-derived fungus Aspergillus terreus LM.5.2. Structures of isolated compounds were determined by a combination of NMR and ESIMS techniques. The absolute configurations of all stereocenters were determined using the Murfey’s method. The isolated compounds 1–3 contain a rare fungi cinnamic acid residue. The cytotoxicity of isolated compounds against several cancer cell lines and inhibition ability of sortase A from Staphylococcus aureus of asterripeptides A–C were investigated.  相似文献   

Genetic diversity and parentage analysis of aspen demes     

Chunxia Zhang  Reiner Finkeldey  Konstantin V. Krutovsky 《New Forests》2016,47(1):143-162

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Impact of oral melatonin on the electroretinogram cone response     

Anne-Marie Gagné  Konstantin V Danilenko  Serge G Rosolen  Marc Hébert 《Journal of circadian rhythms》2009,7(1):14-7

Background  

In the eye, melatonin plays a role in promoting light sensitivity at night and modulating many aspects of circadian retinal physiology. It is also an inhibitor of retinal dopamine, which is a promoter of day vision through the cone system. Consequently, it is possible that oral melatonin (an inhibitor of retinal dopamine) taken to alleviate circadian disorders may affect cone functioning. Our aim was to assess the impact of melatonin on the cone response of the human retina using electroretinography (ERG).  相似文献   

Change in the light-temperature characteristic of CO2 exchange of red clover under cold hardening conditions     

E. S. Kholoptseva  E. G. Popov  S. N. Drozdov  A. F. Titov 《Russian Agricultural Sciences》2009,35(1):26-28

The effect of cold hardening on CO₂ exchange in plants of two red clover varieties is studied under controlled environmental conditions within the framework of a multifactor experiment. It is shown that hardening reduces the potential maximum net photosynthesis of plants, changing the light and temperature conditions that provide achieving it, and increases the dark respiration rate.  相似文献   

Quantitative and qualitative characterisation of humic products with spectral parameters     

Filcheva  Ekaterina  Hristova  Mariana  Nikolova  Pavlina  Popova  Todorka  Chakalov  Konstantin  Savov  Valentin 《Journal of Soils and Sediments》2018,18(8):2863-2867

Purpose

The application of different humic products for the treatment of soils and plants has increased in recent years. The characteristics of humic products, such as the content and composition of organic carbon and the maturity, provide valuable information which is essential for an adequate application. Such information is crucial for manufacturers, business consultants and users involved in the production, distribution and implementation of humic products. This article presents the correlation between the quantitative indicators of commercial humic products and their spectral characteristics via measurements in the ultraviolet spectrum at 300 nm, in the visible area at 445 and 665 nm and in the near-infrared spectrum at 850 nm.

Materials and methods

We evaluated humic products (liquid and solid) of different origins. Via wet combustion, the content of total organic carbon in humic products can be determined. The precipitation of humic acids from the starting solution determines the composition of the humic products in terms of humic acids (HAs) and fulvic acids (FAs). The dissolution of HAs determines their concentration by titration, while the specific extinction can be assessed via spectrophotometry via measuring the absorption of HAs spectra at the following wavelengths: 300, 465, 665 and 850 nm. The degree of aromaticity and condensation of humic products determines the optical density of the HAs via the E₄/E₆ ratio.

Results and discussion

The content of total organic carbon varied widely from 0.55 to 37.5% across all groups. The content of carbon in HAs, as a percentage of the total carbon in fulvic-type humic products, ranged from 1.29 to 16.00%, while in humic-type products, it ranged from 51.43 to 91.92%. The minimum value of the E₄/E₆ ratio was 2.97, while the maximum value was 6.35. We observed a direct relationship between the dominant type of acids in humic products and the E₄/E₆ ratio.

Conclusions

The optical density of HAs indicates their quality characteristics. The presented optical characteristics for humic products show that there is a direct relationship, especially between HAs/FAs and E₄/E₆ ratios. Measurement at 300 nm (E₃₀₀) in the near-ultraviolet area and at 850 nm (E₈₅₀) in the near-infrared area can increase the range of the spectral study.

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Compressing soil structural information into parameterized correlation functions     

Marina V. Karsanina  Efim V. Lavrukhin  Dmitry S. Fomin  Anna V. Yudina  Konstantin N. Abrosimov  Kirill M. Gerke 《European Journal of Soil Science》2021,72(2):561-577

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Long‐term changes of marine subtidal benthic communities in North East Asia (Yellow and Japan seas) in a global change context: A review     

Linlin Chen  Konstantin A. Lutaenko  Xiaojing Li  Xinzheng Li  Zhengquan Zhou  Baoquan Li  Olga N. Pavlyuk  Tatyana S. Tarasova 《水产资源保护:海洋与淡水生态系统》2020,30(7):1451-1475

1. A review of the long‐term changes and variations in benthic communities and the current status of the marine invasive species (MIS) in shallow waters of the Yellow Sea (Chinese sector) and the Sea of Japan (Russian and partly Korean sectors) is presented. This paper reflects on the progress and lessons learned, recommending actions for the future about the conservation of biodiversity.
2. In the Bohai Sea, the benthic ecosystem has been degenerating due to anthropogenic activities such as overfishing and pollution since the 1950s. The dominant position of K‐strategy species is gradually being lost and replaced by R‐strategy species. In the Yellow Sea, the macrobenthic community is different from other areas due to the Yellow Sea Cold Water Mass. Many economic species have been destroyed, and the biotic structure has changed significantly due to overfishing and climate change.
3. In the Russian sector of the Sea of Japan, the macrobenthic communities in the shallow‐water soft bottom have generally been in a stable condition for the last decades, except for some heavily polluted or disturbed areas due to dredging operations. The abundance of select large invertebrate species has changed considerably due to commercial fishing and poaching. Variations in macro? and meiobenthic communities under aquaculture conditions have occurred on a local scale during the last five decades.
4. MIS show obvious differences between China and Russia in the following aspects: introduction pathways of MIS, composition and number of non‐native species, threats and impacts of MIS to native communities and ecosystems, and economic and public health impacts.
5. Long‐term monitoring programmes should be developed to reveal future biotic changes and to separate the effects of cyclic variations of benthic communities from the impacts of pollution and eutrophication. Standardization of sampling procedures is required to compare changes/alternations in benthos across various regions worldwide.

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