scholarly journals Topology, Vegetation and Stratigraphy of Far Eastern Aapa Mires (Khabarovsk Region, Russia)

Land ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 96
Author(s):  
Stanislav Kutenkov ◽  
Vladimir Chakov ◽  
Viktoriya Kuptsova
Keyword(s):  
Continuous Distribution ◽  
Dwarf Shrub ◽  
Surface Pattern ◽  
Northern Eurasia ◽  
Topological Features ◽  
Far Eastern ◽  
Peat Stratigraphy ◽  
Almost Continuous ◽  
Continental Climate ◽  
Active Change

Aapa mires (string-flark fens) are one of the main types of mires in northern Eurasia. It has an almost continuous distribution from Scandinavia to Kamchatka, disappearing in continental climate areas and becoming one of the dominant types in more oceanic zones. This article first presents the topological features of string-flark aapa, their vegetation and peat stratigraphy related to different elements of microrelief at the southernmost borders of boreal mires of cryolithozone (51–52 N), in the Lower Amur region (Russia). String-flark fens are very similar to the aapa mires originally reported for the European North. The waterlogged minerotrophic central fen, with a ribbed surface pattern, is surrounded by oligotrophic bogs. The mosaic structure of the vegetation cover in the fens is determined by microtopography: mesooligotrophic dwarf shrub–herb–sphagnum strings, mesoeutrophic herb–sphagnum lawns, and sparse herb cover in water flarks. The flora, for the most part, corresponds with the European aapa, and has some characteristics of eastern features. We relate the localized evolution of string-flark complexes with water basin hydrology changes. The formation of string-flark complexes in pre-existing fens was preceded by the cessation of river flood waters over the surface of the mires. The further decline of erosion has led to the development of dwarf shrub–sphagnum communities containing microrelief. The immature strings of the aapa mires attest to the ongoing active change processes of the mires.

Diploid and tetraploid Casuarina littoralis Salisb. (Syn. C. suberosa Ott. & Dietr.)

1958 ◽  
Vol 6 (1) ◽  
pp. 38 ◽  
Author(s):  
BA Barlow
Keyword(s):  
New South ◽  
New South Wales ◽  
Continuous Distribution ◽  
Tetraploid Form ◽  
South Wales ◽  
Eastern Australia ◽  
Almost Continuous ◽  
Distinct Distribution

Within the species Casuarina littoralis there are diploid and tetraploid forms, having 22 and 44 chromosomes respectively. Previous records of 2n = 48 are erroneous. The tetraploid form has an almost continuous distribution in eastern Australia and Tasmania, whilst the diploid has a small, distinct distribution in New South Wales and Queensland. Under certain conditions hybridization has oocurred.

Flight and Dispersal of the European Pine Shoot Moth, Rhyacionia buoliana (Schiff.) I. Factors Affecting Flight, and the Flight Potential of Females

1962 ◽  
Vol 94 (3) ◽  
pp. 282-299 ◽  
Author(s):  
G. W. Green
Keyword(s):  
Continuous Distribution ◽  
Factors Affecting ◽  
Nursery Stock ◽  
Rapid Spread ◽  
Main Factors ◽  
Natural Dispersal ◽  
Almost Continuous

In a recent paper, Pointing (8) described the distribution of the European pine shoot moth, Rhyacionia buoliana (Schiff.), in Ontario. Since first discovered in the Toronto area in 1925, the insect has become widely dispersed, so that at the present time, it appears in almost continuous distribution wherever red and Scots pines grow in southwestern Ontario. Two main factors are responsible for the rapid spread of the infestations, (a) the chance planting of infested nursery stock, and (b) the natural dispersal tendencies of the species. This, and the succeeding paper of this series, will be concerned with the natural dispersal of the shoot moth; dispersal, as used throughout both papers, describing movement beyond the tree on which the insect hatched from the egg.

scholarly journals Estimation of nocturnal<sup>222</sup>Rn soil fluxes over Russia from TROICA measurements

2013 ◽  
Vol 13 (23) ◽  
pp. 11695-11708 ◽  
Author(s):  
E. V. Berezina ◽  
N. F. Elansky ◽  
K. B. Moiseenko ◽  
I. B. Belikov ◽  
R. A. Shumsky ◽  
...  
Keyword(s):  
Thermal Structure ◽  
Regional Scale ◽  
Tectonic Activity ◽  
Northern Eurasia ◽  
Atmospheric Conditions ◽  
Accumulation Rates ◽  
Near Surface ◽  
Far Eastern Russia ◽  
Orogenic Belts ◽  
Far Eastern

Abstract. In TROICA (TRanscontinental Observations Into the Chemistry of the Atmosphere) campaigns (1999–2008), the simultaneous observations of near surface 222Rn concentrations and atmospheric boundary layer thermal structure were performed along the Trans-Siberian Railway across northern Eurasia from Moscow to Vladivostok, including central, southern and far eastern parts of Russia. The data on 222Rn and temperature vertical distribution are used to estimate 222Rn regional scale soil fluxes based on calculations of nocturnal 222Rn accumulation rates in the surface layer under inversion conditions. An effect of seasonal soil thawing on 2–4 times surface 222Rn concentration increase from summer 1999 to autumn 2005 is observed. The estimated 222Rn regional averaged fluxes vary over Russia from 29 ± 8 mBq m−2 s−1 in its so-called European territory to 95 ± 51 mBq m−2 s−1 in the southern area of Siberia. The highest 222Rn fluxes are derived in the regions of high tectonic activity and orogenic belts of central and eastern Siberia and in far eastern Russia. The observed high 222Rn flux variations in specific events show a strong effect of both soil and atmospheric conditions on 222Rn near-surface abundance and the derived seasonal patterns over the continent.

scholarly journals Microscopic research on the olfactory organ of the Far Eastern brook lamprey Lethenteron reissneri (Pisces, Petromyzontidae)

2020 ◽  
Vol 50 (1) ◽  
Author(s):  
Hyun-Tae Kim ◽  
Jong-Young Park
Keyword(s):  
Continuous Distribution ◽  
First Record ◽  
Sensory Epithelium ◽  
Olfactory Organ ◽  
Supporting Cells ◽  
Adaptive Structure ◽  
Stereo Microscope ◽  
Olfactory Anatomy ◽  
Far Eastern ◽  
Sand Bottom

Abstract The olfactory anatomy and histology of Lethenteron reissneri were researched using a stereo microscope, a light microscope, and a scanning electron microscope. As in other lampreys, it shows same characters as follows: i) a single olfactory organ, ii) a single tubular nostril, iii) a single olfactory chamber with gourd-like form, iv) a nasal valve, v) a nasopharyngeal pouch, vi) a sensory epithelium (SE) of continuous distribution, vii) a supporting cells with numerous long cilia, viii) an accessory olfactory organ. However, the description of a pseudostratified columnar layer in the SE and Non SE is a first record, not reported in sea lamprey Petromyzon marinus. In particular, both 19 to 20 lamellae in number and olfactory receptor neuron’s quarter ciliary length of the knob diameter differ from those of P. marinus. From these results, it might be considered that the olfactory organ of L. reissneri shows well adaptive structure of a primitive fish to slow flowing water with gravel, pebbles, and sand and a hiding habit into sand bottom at daytime. The lamellar number and neuron’s ciliary length may be a meaningful taxonomic character for the class Petromyzonida.

scholarly journals Microscopic research on the olfactory organ of the Far Eastern brook lamprey Lethenteron reissneri (Pisces, Petromyzontidae)

2020 ◽  
Author(s):  
Hyun-Tae Kim ◽  
Jong-Young Park
Keyword(s):  
Continuous Distribution ◽  
First Record ◽  
Sensory Epithelium ◽  
Olfactory Organ ◽  
Supporting Cells ◽  
Adaptive Structure ◽  
Stereo Microscope ◽  
Olfactory Anatomy ◽  
Far Eastern ◽  
Sand Bottom

Abstract The olfactory anatomy and histology of Lethenteron reissneri were researched using a stereo microscope, a light microscope, and a scanning electron microscope. As in other lampreys, it shows same characters as follows: i) a single olfactory organ, ii) a single tubular nostril, iii) a single olfactory chamber with gourd-like form, iv) a nasal valve, v) a nasopharyngeal pouch, vi) a sensory epithelium (SE) of continuous distribution, vii) a supporting cells with numerous long cilia, viii) an accessory olfactory organ. However, the description of a pseudostratified columnar layer in the SE and Non SE is a first record, not reported in sea lamprey Petromyzon marinus. In particular, both 19 to 20 lamellae in number and olfactory receptor neuron’s quarter ciliary length of the knob diameter differ from those of P. marinus. From these results, it might be considered that the olfactory organ of L. reissneri shows well adaptive structure of a primitive fish to slow flowing water with gravel, pebbles, and sand and a hiding habit into sand bottom at daytime. The lamellar number and neuron’s ciliary length may be a meaningful taxonomic character for the class Petromyzonida.

scholarly journals The Influence of Hydrogeological Factors on the Railway Stability in the Areas of Island Permafrost Distribution (by the Example of the Trans-Baikal Railway, Russia)

2021 ◽  
Vol 906 (1) ◽  
pp. 012090
Author(s):  
Andrey Melnikov ◽  
Pavel Kuznetsov
Keyword(s):  
High Speed ◽  
Research Work ◽  
Continuous Distribution ◽  
Frozen Soil ◽  
Railway Track ◽  
Joint Research ◽  
Frozen Soils ◽  
The Road ◽  
Permafrost Soils ◽  
Far Eastern

Abstract Changes in the geocryological situation at the road base and in the adjacent territory should be predicted based on an analysis of regional features of the “climate – landscape – cryolithozone – construction” system. These relationships are manifested in various ways across various cryolithozone regions, with these differences being rather poorly understood. In this regard, in 2019, the Melnikov Permafrost Institute (Yakutsk, Russia) and the Northwest Institute of Eco-Environment and Resources of the Chinese Academy of Sciences signed an agreement on joint research work in order to elucidate the evolution of frozen soils, as well as to justify the application of certain measures to stabilise the permafrost environment. These projects aim to study the cryolithozone response along the routes of projected high-speed highways and existing railway tracks. Since 2019, the Institutes’ representatives along with specialists from the Tynda permafrost station (the branch of Russian Railways), North-Eastern Federal University (Neryungri, Russia), Zabtransproekt (Chita, Russia) and the Institute of Natural Resources, Ecology and Cryology of the Siberian Branch of RAS (Chita, Russia) have been investigating individual sections of the Far Eastern and Trans-Baikal railways in Russia. Some areas here are characterised by the continuous distribution of permafrost soils, while others – by island permafrost distribution. These areas share such common features, as the significant lifetime of linear structures (lasting for several tens of years) and the presence of deformations of the railway track, which appeared in the first years after construction. Railway track sections installed in high-temperature frozen soils are of particular interest for monitoring. However, the construction deformations are not always caused by frozen soil degradation. This article presents the results of surveys at one of such objects – a section of the track confined to the Chernovskaya station of the Trans-Baikal railway.

scholarly journals Microscopic research on the olfactory organ of the Far Eastern brook lamprey Lethenteron reissneri (Pisces, Petromyzontidae)

2020 ◽  
Author(s):  
Hyun-Tae Kim ◽  
Jong-Young Park
Keyword(s):  
Continuous Distribution ◽  
First Record ◽  
Sensory Epithelium ◽  
Olfactory Organ ◽  
Supporting Cells ◽  
Adaptive Structure ◽  
Stereo Microscope ◽  
Olfactory Anatomy ◽  
Far Eastern ◽  
Sand Bottom

Abstract The olfactory anatomy and histology of Lethenteron reissneri were researched using a stereo microscope, a light microscope, and a scanning electron microscope. As in other lampreys, it shows same characters as follows: i) a single olfactory organ, ii) a single tubular nostril, iii) a single olfactory chamber with gourd-like form, iv) a nasal valve, v) a nasopharyngeal pouch, vi) a sensory epithelium (SE) of continuous distribution, vii) a supporting cells with numerous long cilia, viii) an accessory olfactory organ. However, the description of a pseudostratified columnar layer in the SE and Non SE is a first record, not reported in sea lamprey Petromyzon marinus. In particular, both 19 to 20 lamellae in number and olfactory receptor neuron’s quarter ciliary length of the knob diameter differ from those of P. marinus. From these results, it might be considered that the olfactory organ of L. reissneri shows well adaptive structure of a primitive fish to slow flowing water with gravel, pebbles, and sand and a hiding habit into sand bottom at daytime. The lamellar number and neuron’s ciliary length may be a meaningful taxonomic character for the class Petromyzonida.

scholarly journals Microscopic research on the olfactory organ of the Far Eastern brook lamprey Lethenteron reissneri (Pisces, Petromyzontidae)

2020 ◽  
Author(s):  
Hyun-Tae Kim ◽  
Jong-Young Park
Keyword(s):  
Continuous Distribution ◽  
First Record ◽  
Sensory Epithelium ◽  
Olfactory Organ ◽  
Supporting Cells ◽  
Adaptive Structure ◽  
Stereo Microscope ◽  
Olfactory Anatomy ◽  
Far Eastern ◽  
Sand Bottom

Abstract The olfactory anatomy and histology of Lethenteron reissneri were researched using a stereo microscope, a light microscope, and a scanning electron microscope. As in other lampreys, it shows same characters as follows: i) a single olfactory organ, ii) a single tubular nostril, iii) a single olfactory chamber with gourd-like form, iv) a nasal valve, v) a nasopharyngeal pouch, vi) a sensory epithelium (SE) of continuous distribution, vii) a supporting cells with numerous long cilia, viii) an accessory olfactory organ. However, the description of a pseudostratified columnar layer in the SE and NSE is a first record, not reported in sea lamprey Petromyzon marinus. In particular, both 19 to 20 lamellae in number and olfactory receptor neuron’s quarter ciliary length of the knob diameter differ from those of P. marinus. From these results, it might be considered that the olfactory organ of L. reissneri shows well adaptive structure of a primitive fish to slow flowing water with gravel, pebbles, and sand and a hiding habit into sand bottom at daytime. The lamellar number and neuron’s ciliary length may be a meaningful taxonomic character for the class Petromyzonida.

D. The Line Spectrum of Pulsating Variable Stars

1967 ◽  
Vol 28 ◽  
pp. 207-244
Author(s):  
R. P. Kraft
Keyword(s):  
Variable Stars ◽  
The Other ◽  
Line Spectrum ◽  
Afternoon Session ◽  
Empirical Information ◽  
Pulsating Variable Stars ◽  
Almost Continuous ◽  
Informal Approach

(Ed. note:Encouraged by the success of the more informal approach in Christy's presentation, we tried an even more extreme experiment in this session, I-D. In essence, Kraft held the floor continuously all morning, and for the hour and a half afternoon session, serving as a combined Summary-Introductory speaker and a marathon-moderator of a running discussion on the line spectrum of cepheids. There was almost continuous interruption of his presentation; and most points raised from the floor were followed through in detail, no matter how digressive to the main presentation. This approach turned out to be much too extreme. It is wearing on the speaker, and the other members of the symposium feel more like an audience and less like participants in a dissective discussion. Because Kraft presented a compendious collection of empirical information, and, based on it, an exceedingly novel series of suggestions on the cepheid problem, these defects were probably aggravated by the first and alleviated by the second. I am much indebted to Kraft for working with me on a preliminary editing, to try to delete the side-excursions and to retain coherence about the main points. As usual, however, all responsibility for defects in final editing is wholly my own.)

Electron-Mirror Microscopic Aspects of Ferroelectric Domains of BaTiO3 And Ca2Sr (C2H5CO2)6

1970 ◽  
Vol 28 ◽  
pp. 478-479
Author(s):  
Teruo Someya ◽  
Jinzo Kobayashi
Keyword(s):  
Surface Layer ◽  
Electric Fields ◽  
Quantitative Study ◽  
Recent Progress ◽  
Ferroelectric Domain ◽  
Resolving Power ◽  
Surface Pattern ◽  
Crystal Surfaces ◽  
One Dimensional ◽  
Ferroelectric Domains

Recent progress in the electron-mirror microscopy (EMM), e.g., an improvement of its resolving power together with an increase of the magnification makes it useful for investigating the ferroelectric domain physics. English has recently observed the domain texture in the surface layer of BaTiO3. The present authors ) have developed a theory by which one can evaluate small one-dimensional electric fields and/or topographic step heights in the crystal surfaces from their EMM pictures. This theory was applied to a quantitative study of the surface pattern of BaTiO3).

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