scholarly journals Rare component as an indicator of human flora transformation

2017 ◽  
Vol 6 (1) ◽  
pp. 37-41
Author(s):  
Olga Viktorovna Kozlovskaya ◽  
Yuliya Vitalevna Belyaeva
Keyword(s):  
Rare Species ◽  
Unit Area ◽  
Stress Factors ◽  
Anthropogenic Stress ◽  
Anthropogenic Transformation ◽  
Species Saturation ◽  
Alien Flora ◽  
Dynamic Components ◽  
Human Flora ◽  
Relative Factors

This paper discusses the use of the rare flora component of Melekessky-Stavropol landscaped area as an indicator of anthropogenic transformation. The paper contains an ecological-floristic zoning of Melekessky-Stavropol landscaped area (lowland Trans-Volga) and the value of anthropogenic stress factors for each elementary floristic subarea and for the landscape area as a whole. The factors value due to non-equivalent sub-areas and lack of research is formalized and pointed. Relative factors values are compared to the total factor value for the landscape area. Rare flora component was studied and rarity species saturation was calculated, i.e. their number per unit area for each of the elementary floristic sub-areas. The authors revealed the dependence of rarity species saturation on the level of anthropogenic load in elementary subareas - the higher the rarity species saturation, the less anthropogenically transformed flora. A corresponding graph is presented and described in detail that makes it possible to estimate the anthropogenic transformation of flora, not only its active, dynamic components - alien flora, but also the degree of preservation of rare species.

Improvement of separate elements of the techno-logy of cultivation of white cabbage in the conditions of the of the central region of the non-chernozem zone

2020 ◽  
Author(s):  
A.V. Konstantinovich ◽  
◽  
A.S. Kuracheva ◽  
E.D. Binkevich
Keyword(s):  
Seed Treatment ◽  
Unit Area ◽  
Growing Season ◽  
Agricultural Products ◽  
Stress Factors ◽  
High Quality ◽  
Temperature And Precipitation ◽  
White Cabbage ◽  
Sowing Seed

In conditions of climate change, when temperature and precipitation fluctuations occur more and more frequently during the growing season, it is necessary to obtain high quality seedlings with "immunity" to various stress factors, including high weediness, the damage from which is associated with a decrease in yield (by 25 -35%) and with a deterioration in the quality of agricultural products. Due to the imbalance in production technology, seedlings are often weakened, overgrown, with a low yield per unit area and survival rate in the field. One of the solutions to this problem is the use of PP for pre-sowing seed treatment to increase the competitiveness of seedlings in the field.

Multiple stress – combined effects of natural and anthropogenic stress factors on organisms in boreal lakes

2002 ◽  
Vol 28 (2) ◽  
pp. 958-961
Author(s):  
Ismo J. Holopainen ◽  
Jari Heinonen ◽  
Olli-Pekka Penttinen ◽  
Jussi V. K. Kukkonen
Keyword(s):  
Boreal Lakes ◽  
Stress Factors ◽  
Combined Effects ◽  
Anthropogenic Stress ◽  
Multiple Stress

scholarly journals ANALYSIS OF THE ALIEN FLORA OF DNIPROPETROVSK PROVINCE

2016 ◽  
Vol 6 (3) ◽  
pp. 419-429 ◽  
Author(s):  
B. Baranoski ◽  
N. Khromykh ◽  
L. Karmyzova ◽  
I. Ivanko ◽  
Y. Lykholat
Keyword(s):  
Life History ◽  
Alien Species ◽  
Plant Invasion ◽  
Species Number ◽  
Positive Trend ◽  
Species Status ◽  
Anthropogenic Transformation ◽  
Alien Flora ◽  
Invasive Status ◽  
Total Species

<p>Plant invasion in the Northern Steppe Dnieper has a long history complicated by excessive anthropogenic transformation of territory. Alien species status, origin areas, life history, and invasive tendency of alien species in Dnipropetrovsk region were investigated. The presence of 286 alien species of 61 families was registered. Some 7 families had the greatest species diversity (156 alien species that was 55% of total species number); 30 families were represented by 2–9 alien species, and 24 families contained only 1 alien species. So, the current proportion of the alien species was almost 17% in the regional flora. Archaeophytes consist of 40% of the total alien species, while neophytes had more than 60%. The proportion of naturalized species amounted 58% from alien species, whereas the share of casual species was 42%. The greatest abundance of alien species was typical for <em>Brassicaceae</em>, <em>Asterasea</em>, and <em>Poaceae </em>(14, 13, and 9% of the total species number). We proved invasive status of 28 species and positive trend regard alien species ratio for last years. </p>

SOIL SALINIZATION AND ITS INFLUENCE THE PLANTS

2020 ◽  
Vol 3 (1) ◽  
pp. 28-42
Author(s):  
V.V. IVANISHCHEV ◽  
◽  
T.N. EVGRASHKINA ◽  
O.I. BOIKOVA ◽  
N.N. ZHUKOV ◽  
...  
Keyword(s):  
Soil Salinization ◽  
Stress Factors ◽  
Anthropogenic Stress ◽  
Analysis Method ◽  
Biochemical Adaptation ◽  
Winter Triticale ◽  
Different Types ◽  
Cluster Analysis Method ◽  
Agricultural Plants ◽  
The Common

The work collected information on salinization of soils, as one of the common natural and, in part, anthropogenic stress factors. The main types of soil salinization, their features, and also their distribution in Russia are described. The results of a comparative analysis of the effect of various types of salinization on agricultural plants (using the example of winter triticale) are presented. The possibility of application the cluster analysis method to assess the specifics of the biochemical adaptation of plants to different types of salinization of the medium is shown.

scholarly journals Assessment of the impact of railway traffic on the state of plant communities

2020 ◽  
Vol 164 ◽  
pp. 03048
Author(s):  
Elena Popova
Keyword(s):  
Species Diversity ◽  
Plant Communities ◽  
Anthropogenic Impact ◽  
Hypericum Perforatum ◽  
Anthropogenic Stress ◽  
Biological Productivity ◽  
Anthropogenic Transformation ◽  
Railway Traffic ◽  
Disturbed Habitats ◽  
The Impact

The article reflects the results of studies on the impact of railway traffic on plant communities. The anthropogenic impact on the environment is complex. Many factors affect the species diversity of the flora near railways in different ways. The accumulation of Cd, Zn, Pb, Cr in plants of Pimpinella saxifraga L., Hypericum perforatum L., Trifolium medium L was revealed. The anthropogenic stress leads to disruption of naturally formed ecosystems, which manifests in a decrease in species diversity, density and biological productivity. As a result of the anthropogenic impact adventitious plants appear, the share of which is 11% of the flora. Research in this area contributes to a deeper understanding of the processes of anthropogenic transformation of floristic complexes and should become the basis for environmental monitoring of disturbed habitats.

scholarly journals New and rare lichens and allied fungi from the Pskov Region, Russia

2018 ◽  
Vol 55 ◽  
pp. 21-31 ◽  
Author(s):  
Nina B. Istomina ◽  
Olga V. Likhacheva ◽  
Irina S. Stepanchikova ◽  
Ekaterina S. Kuznetsova ◽  
Dmitry E. Himelbrant
Keyword(s):  
19Th Century ◽  
Rare Species ◽  
European Russia ◽  
Anthropogenic Transformation ◽  
Lichenicolous Fungi ◽  
Pskov Region ◽  
High Level ◽  
The 19Th Century

Forty-one species of lichens and two lichenicolous fungi are reported from the Pskov Region. Of them, thirty-nine species are new for the region, including Lempholemma dispansum – a rare species with scattered distribution, previously recorded only once in the European Russia in the 19th century. The most important findings are confined to ancient limestone outcrops and old manor parks: these habitats are also promising for further investigations, taking in account high level of anthropogenic transformation of the Pskov Region.

Radiation Damage, Contrast and Statistics in High Resolution Biological Electron Microscopy

1970 ◽  
Vol 28 ◽  
pp. 260-261
Author(s):  
Robert M. Glaeser
Keyword(s):  
High Resolution ◽  
Particle Flux ◽  
Unit Area ◽  
Signal To Noise ◽  
Resolution Image ◽  
High Resolution Image ◽  
Pass Through ◽  
Counting Statistics ◽  
The Relationship ◽  
Picture Element

It is well known that a large flux of electrons must pass through a specimen in order to obtain a high resolution image while a smaller particle flux is satisfactory for a low resolution image. The minimum particle flux that is required depends upon the contrast in the image and the signal-to-noise (S/N) ratio at which the data are considered acceptable. For a given S/N associated with statistical fluxtuations, the relationship between contrast and “counting statistics” is s131_eqn1, where C = contrast; r2 is the area of a picture element corresponding to the resolution, r; N is the number of electrons incident per unit area of the specimen; f is the fraction of electrons that contribute to formation of the image, relative to the total number of electrons incident upon the object.

Reconstruction of Objects from their Projections Using Orthogonal Functions

1973 ◽  
Vol 31 ◽  
pp. 268-269
Author(s):  
Elrnar Zeitler
Keyword(s):  
Unit Area ◽  
Three Dimensional ◽  
One Dimension ◽  
Spatial Density ◽  
Dimensional Representation ◽  
Orthogonal Functions ◽  
Object A ◽  
Plane Normal ◽  
Dimensional Object ◽  
Spatial Density Distribution

Considering any finite three-dimensional object, a “projection” is here defined as a two-dimensional representation of the object's mass per unit area on a plane normal to a given projection axis, here taken as they-axis. Since the object can be seen as being built from parallel, thin slices, the relation between object structure and its projection can be reduced by one dimension. It is assumed that an electron microscope equipped with a tilting stage records the projectionWhere the object has a spatial density distribution p(r,ϕ) within a limiting radius taken to be unity, and the stage is tilted by an angle 9 with respect to the x-axis of the recording plane.

Morphometric SEM study of the effects of ACTH on endothelial fenestrae in the rat adrenal cortex

1984 ◽  
Vol 42 ◽  
pp. 234-235
Author(s):  
J. Curtis ◽  
K. S. Schwartz ◽  
R. P. Apkarian
Keyword(s):  
Anterior Pituitary ◽  
Lipid Droplets ◽  
Adrenocorticotropic Hormone ◽  
Unit Area ◽  
High Density Lipoproteins ◽  
Capillary Endothelium ◽  
Zona Fasciculata ◽  
Sem Study ◽  
Saline Vehicle ◽  
Scanning Electron

A scanning electron microscope (SEM) study was made of the effect of adrenocorticotropic hormone (ACTH) on the size and numbers of fenestrae/unit area in the capillary endothelium of the zona fasciculata (ZF) of the rat adrenal. The stimulatory effect of ACTH on cholesterol uptake via high density lipoproteins in the rat and evidence for the secretion of glucocorticoids by exocytosis of lipid droplets described by Rhodin suggest that endothelial change may accompany these transport phenomena.Twelve rats received two Dexamethasone (DEX) ip injections (25 μg DEX/100 g body wt.), the first at 8 PM and the second at 8 AM the next day, to inhibit the release of endogenous ACTH by the anterior pituitary. The animals were then divided into two groups. Six animals received only saline vehicle and six rats received ACTH (100 ng/100 g body wt.).

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