Diversity of vascular plants and zooplankton communities in regard to the ecological assessment of the territory of the ecological park “Samara Venice”, Samara Region, Russia

The results of the floristic and hydrobiological studies performed in May - August 2020 on the territory of the ecological park Samara Venice (Samara Region, Russia) are presented. These data form the basis for the ecological assessment of the territory. The diversity of vascular plants is presented by 4 divisions, 65 families, 205 genera, and 309 species. Among them, 66 species (21.4%) belong to the alien plant species, including nine invasive. Habitats of the plants included in the regional Red List are found. The zooplankton diversity comprises 60 species and morphs. The zooplankton community has undergone significant transformation, manifesting by an increase in the total biomass and in the biomass of crustaceans and rotifers, and by a decrease in absolute and relative species richness. It is revealed that a number of the studied water bodies belong to the transitional type, and may be characterized as of middle position between the meso- to eutrophic type (moderately polluted and polluted waters).

Phytocenological Assessment of Vicia grandiflora Scop. on the Steppe Plateau (Azerbaijan)

Assessment of the cenopulations of the possessing of high fodder qualities Viciа grandiflora Scop. species of the Legume family (Fabaceae) have been shown in the paper. Changes in the ontogenesis of V. grandiflora species were analyzed, an increase in the number of subsenil and senile individuals was observed, also young, old, transitional cenopopulations types were identified, but juvenile and immature individuals were not found in some phytocenoses. Transitional type of studied populations was found (∆=0,31–0,52; ὠ=0,54–0,63). Only evolving vitality was observed under assessment of the dynamics of development population and one-way irreversible changes were observed. The obtained results indicating a decrease in the number and underdevelopment of the cenosis, confirmed the danger of extinction of Vicia grandiflora species on the territory of the Steppe plateau.

EVALUATION OF RADIOLOGICAL FEATURES AND TUMOUR CHARACTERISTICS AND THEIR SIGNIFICANCE IN OUTOME OF INTRACRANIAL MENINGIOMAS

Meningioma is one of the most common intracranial tumours. Several advancements have been made for establishing the etiopathogenesis of meningiomas, including gene mutation and DNA methylation. Many factors have been found to be associated with tumour grade, time to recurrence, overall survival and prognosis. Today, with the availability of detailed radiological assessment and better micro neurosurgical techniques, the outcome has improved signicantly. This study is aimed at evaluating detailed radiological features of meningiomas along with its characteristics like vascularity, adhesiveness and edema and to determine their signicance in outcome. SUMMARY: Meningioma is amongst the most common brain tumours. Several factors have been found to be associated with its origin, growth, grade, time to recurrence, outcome and overall prognosis. This prospective evaluation of 68 consecutive patients of intracranial meningioma was aimed at evaluating their detailed radiological features along with tumour characteristics like vascularity, adhesiveness and edema and to determine their signicance in outcome. Our study showed MRI was most useful tool for preoperative evaluation of tumour characteristics like edema, vascularity and adhesiveness which guide surgical outcome. Less vascular and adhesive tumours had good outcome as compared to highly vascular and strongly adhesive tumours. Size of tumour too was associated with outcome. In our study, all patients (100%) of grade 0 tumour removal had good outcome which was statistically highly signicant (p<0.01). Most common histological variant was transitional type. We advocate aggressive surgical therapy as the primary and main mode of treatment in relation to the preoperative characteristics and features from imaging studies.

Anatomical structure of the stem Bidens tripartita (Asteraceae) in connection with habitat

Internal structure of the stem in internodes of metamers middle and upper zones of inhibition, amplificationzone in generative individuals Bidens tripartita L. is described. It is of a transitional type, for a longer length – hollow.Epidermis with an anomocytic type of stomatal apparatus. Anatomical structure of the stem in plants from two communitieswas compared. Due to close biotope conditions, the biometric parameters of the structures do not differ.

Comparative seed coat anatomy of the genus Wollemia (Araucariaceae)

The seed coat anatomy of Wollemia nobilis W. G. Jones, K. D. Hill et J. M. Allen was carried out. In theresult of analysis of transverse sections of seeds the sufficient parenchymatization of seed coats and their differentiationinto three morphogenetic zones – the exotesta, the mesotesta and the endotesta was revealed. Such characters of thespermoderm as differentiation of the mesotesta into several topographic zones, presence of resin cavities in mesotesta, aswell as the participation of both exotesta and mesotesta in making the wing are treated as the archaic ones. The seeds of W.nobilis are of transitional type between exomesotestal and the exotestal type (according to Corner's typology). In generalthe seed coat structure of W. nobilis fits into the divercity of seed coats structure in the family Araucariaceae and is treatedas a progressive type within the family.

Comparative carpology of the genus Cardiocrinum (Endl.) Lindl. (Liliaceae)

The anatomy of pericarp of the mature fruit of Cardiocrinum cordatum (Thunb.) Makino was investigated.It was revealed, that the fruit of Cardiocrinum is a superior loculicidal capsule. The anatomy of its pericarp allow totreat the fruit as a transitional type of capsules between Lilium-type (the endocarp is lignified) and Galanthus-type (nolignification occurs in any zone of the pericarp). The peculiarities of pricarp structure of Cardiocrinum supports itstreatmend as a separate genus of the Liliaceae family.

SN 2017ivv: two years of evolution of a transitional Type II supernova

ABSTRACT We present the photometric and spectroscopic evolution of the Type II supernova (SN II) SN 2017ivv (also known as ASASSN-17qp). Located in an extremely faint galaxy (Mr = −10.3 mag), SN 2017ivv shows an unprecedented evolution during the 2 yr of observations. At early times, the light curve shows a fast rise (∼6−8 d) to a peak of ${\it M}^{\rm max}_{g}= -17.84$ mag, followed by a very rapid decline of 7.94 ± 0.48 mag per 100 d in the V band. The extensive photometric coverage at late phases shows that the radioactive tail has two slopes, one steeper than that expected from the decay of 56Co (between 100 and 350 d), and another slower (after 450 d), probably produced by an additional energy source. From the bolometric light curve, we estimated that the amount of ejected 56Ni is ∼0.059 ± 0.003 M⊙. The nebular spectra of SN 2017ivv show a remarkable transformation that allows the evolution to be split into three phases: (1) Hα strong phase (&lt;200 d); (2) Hα weak phase (between 200 and 350 d); and (3) Hα broad phase (&gt;500 d). We find that the nebular analysis favours a binary progenitor and an asymmetric explosion. Finally, comparing the nebular spectra of SN 2017ivv to models suggests a progenitor with a zero-age main-sequence mass of 15–17 M⊙.

The Effectiveness of Using Bitumen Emulsion in the Technology of Dedusting Roads with a Transitional Type of Coating

The article considers the effectiveness of using bitumen emulsion in technologies for dedusting sections of the Vilyui A-331 federal highway. The sections allocated for the work have transitional coatings of sand and gravel (crushed stone), crushed stone sand and gravel mixtures. Their wear degree is up to 100% and they belong to dust-forming and highly dusting ones. The average traffic intensity on Vilyui A-331 highway is 937 units per day. The efficiency of technologies for dedusting coatings of transitional type has been evaluated and the prospects of using cationic bitumen emulsions for these purposes have been shown.