scholarly journals Zarys przyrodniczych i antropogenicznych uwarunkowań rozwoju systemów dolinnych i korytowych w Polsce

2018 ◽  
Vol 37 ◽  
pp. 17-51
Author(s):  
Leon Andrzejewski ◽  
Kazimierz Krzemień ◽  
Zbigniew Zwoliński
Keyword(s):  
Climate Changes ◽  
Current Knowledge ◽  
River Channel ◽  
Anthropogenic Factors ◽  
Crucial Importance ◽  
Different Types ◽  
Channel Patterns ◽  
River Valleys ◽  
Natural And Anthropogenic Factors ◽  
Channel Systems

The paper is an attempt to review the state of current knowledge and discussion on the evolution and typology of valley and river channel systems in Poland. Contemporary landscapes of valley systems and river channel systems reflect the overlap of multiple natural and anthropogenic factors. Among them, climate changes and regional morphotectonic and morphogenetic determinants are of crucial importance. Over the last decades, these landscapes have undergone substantial transformations, among others as a result of climate change and as a consequence of changing hydrological conditions, land use, as well as a result of increasing human interference in river channel and valley systems. It thus follows from the circumstances that attempts are made to classify different evolutionary types and subtypes of river valleys and different types of contemporary river channel patterns and floodplains that reflect complex and often overlapping natural and anthropogenic conditions.

scholarly journals Specific Features of the Northern Europe River Channel Systems Management (the Vistula and the Severnaya Dvina as examples)

2015 ◽  
pp. 65
Author(s):  
Keyword(s):  
Russian Federation ◽  
River Channel ◽  
Anthropogenic Factors ◽  
Northern Europe ◽  
Systems Management ◽  
Channel Deformations ◽  
The City ◽  
Channel Systems

Historic transformation of the two major rivers of the Northern Europe, namely the Vistula (Poland) and the Severnaya Dvina (Russian Federation) has been considered. These rivers channel regime anthropogenic factors that determine distinctions in bed transformations characteristic forms, distribution of the bed morphological/dynamic types, and deposition runoffs have been compared. Special features of channel deformations within the city boundaries have been analyzed with Velikiy Ustyug on the Severnaya Dvina and Torun on the Vistula as examples. The role of anthropogenic bed transformation in the hazardous hydrological phenomena formation has been analyzed.

scholarly journals ЛІСІВНИЧО-ТАКСАЦІЙНІ ОСОБЛИВОСТІ ГРАБНЯКІВ ПРИРОДНОГО ЗАПОВІДНИКА «МЕДОБОРИ»

2020 ◽  
Vol 78 (4) ◽  
pp. 6-10
Author(s):  
U. O. Bachynska
Keyword(s):  
Age Groups ◽  
Anthropogenic Factors ◽  
Zonal Vegetation ◽  
Oak Trees ◽  
Different Types ◽  
Seed Origin ◽  
The Stability ◽  
The One ◽  
Natural And Anthropogenic Factors ◽  
L 13

In the Nature Reserve of Medobory a zonal vegetation is represented by dark deciduous forests, with a hornbeam and oak trees mainly, dominated by Quercus robur, Caprius betulus, and Flaxinus excelsior. Within the tree stands hornbeam predominates on the area of 21.7% of the forested lands of the reserve. Preliminary investigations of the Reserve hornbeam plantations were conducted by Mykola Korol and Ihor Humeniuk. They pointed to the stability of these plantations, their high competitive abilities but depleted biotic potential. The objects, selected for the study, are permanent trial areas, where during the last taxation measurements the hornbeam dominations in the tree stands were observed (with the tree stands of 6 and more items). On the studied trial areas mature and overmature plantations prevail by age groups. The hornbeams grow here mainly in young hornbeam forests in the first, second and third bonitets. The predominant number of trees on the trial areas is hornbeam of seed origin. Except L-28, where the conditions of growth are dry oakery on the rock, the hornbeams grow on the third bonitet and are of sprouting origin mainly. The tree stands on the trial areas are of the same age. As for the age groups they are mature and overmature, except for L-13 and L-28, where the young stocks grow, and L-13, where the one of a middle age grow. The tree stands taxation indicators on the trial areas are characterized by some differences, depending on age and completeness, within different types. The stock of live wood is on average 115-463 cubic metres per hectare. Trees differentiations by the degree of thickness show the process of a plant formation depending on their origin and age. On the trial areas the renewal of a hornbeam is represented by one- and two-years-old undergrowth. The forest stands are characterized by insignificant variability of their taxation structure indicators, being the result of a slight influence of natural and anthropogenic factors.

scholarly journals Melatonin in Cancer Treatment: Current Knowledge and Future Opportunities

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2506
Author(s):  
Wamidh H. Talib ◽  
Ahmad Riyad Alsayed ◽  
Alaa Abuawad ◽  
Safa Daoud ◽  
Asma Ismail Mahmod
Keyword(s):  
Clinical Trials ◽  
Current Knowledge ◽  
Biological Activities ◽  
Experimental Studies ◽  
Therapeutic Effects ◽  
Cell Proliferation Inhibition ◽  
Different Types ◽  
Solid Foundation

Melatonin is a pleotropic molecule with numerous biological activities. Epidemiological and experimental studies have documented that melatonin could inhibit different types of cancer in vitro and in vivo. Results showed the involvement of melatonin in different anticancer mechanisms including apoptosis induction, cell proliferation inhibition, reduction in tumor growth and metastases, reduction in the side effects associated with chemotherapy and radiotherapy, decreasing drug resistance in cancer therapy, and augmentation of the therapeutic effects of conventional anticancer therapies. Clinical trials revealed that melatonin is an effective adjuvant drug to all conventional therapies. This review summarized melatonin biosynthesis, availability from natural sources, metabolism, bioavailability, anticancer mechanisms of melatonin, its use in clinical trials, and pharmaceutical formulation. Studies discussed in this review will provide a solid foundation for researchers and physicians to design and develop new therapies to treat and prevent cancer using melatonin.

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