Results 51 to 60 of about 51,573 (281)

Raman Spectroscopy of Amphibole Inclusions in Emeralds

Journal of Raman Spectroscopy, EarlyView.
Emeralds containing elongated amphibole inclusions from Austria, Russia, Zambia and Zimbabwe were investigated with an optical microscope and Raman spectroscopy. The inclusions have various sizes and shapes; curved inclusions are frequently observed in emeralds from Zimbabwe and rarely in those from Zambia.
Stefanos Karampelas, Ugo Hennebois, Aurélien Delaunay   +2 more
wiley   +1 more source

On the genesis of deposits of the Pervy Severny iron ore district

Литосфера, 2019
Research subject. This study was aimed at examining iron ore and ore-bearing strata in the Pervy Severny iron ore district in the Northern part of the Tagil depression.
G. A. Petrov
doaj   +1 more source

Mathematical Modeling of Measured Recalescence Velocities

Mathematical Methods in the Applied Sciences, EarlyView.
ABSTRACT A moving‐boundary problem of synchronous directional and volumetric solidification in undercooled liquid drops is formulated and solved. Directional solidification is caused by the temperature gradient along the spatial direction, whereas volumetric growth of new phase elements is caused by the melt undercooling ahead of the phase transition ...
Dmitri V. Alexandrov, Eugenya V. Makoveeva, Alexandra E. Glebova, Liubov V. Toropova   +3 more
wiley   +1 more source

Carboniferous continental margin mafic-ultramafic sheeted dyke complex in the West Magnitogorsk zone (Southern Urals)

Известия высших учебных заведений: Геология и разведка, 2019
In the West of the aHochthon of Magnitogorsk zone thrusted onto the Precambrian complexes of the Uraltau zone, the Devonian island-arc complexes overlap stratigraphicalry the Ordovician and Silurian chert-basalt sequences and serpentine melange.
A. V. Ryazantsev, L. A. Novikov, A. A. Razumovskij   +2 more
doaj   +1 more source

Tracing holotype trajectories: Mapping the movement of the most valuable herbarium specimens

PLANTS, PEOPLE, PLANET, EarlyView.
Global efforts to protect biodiversity depend on fair access to key plant specimens. This study examines the distribution of 119,361 holotypes—unique herbarium specimens used to formally describe new plant species. By linking collection and storage data, we found that holotypes are increasingly held closer to their places of origin, particularly in ...
Dominik Tomaszewski, Łukasz Walas, Marzenna Guzicka   +2 more
wiley   +1 more source

Tree Stands and Their Productivity Dynamics at the Upper Growing Limit in Khibiny on the Background of Modern Climate Changes [PDF]

, 2019
Within the ecotone of the upper limit of woody vegetation on the southeastern macroslope of the Khibiny Mountain ridge (Kola Peninsula), the spatial and age structure, as well as features of the phytomass accumulation of spruce–birch stands, were studied.
Bubnov, M. O., Devi, N. M., Fomin, V. V., Galimova, A. A., Moiseev, P. A.   +4 more
core  

Population structure of the endangered Siberian flying squirrel Pteromys volans revealed by genomic and mitochondrial data

Wildlife Biology, EarlyView.
The Siberian flying squirrel Pteromys volans is an arboreal rodent with a distribution range that covers large parts of the Eurasian taiga forest zone. However, extensive forestry has resulted in widespread local population declines and extinctions in recent decades.
Fernanda Ito, Thomas M. Lilley, Veronika N. Laine, Stefan Prost, Juri P. Kurhinen, Hanna Susi, Sergey N. Gashev, Alexander P. Saveljev, Svetlana N. Bondarchuk, Svetlana G. Babina, Aleksander S. Shishikin, Dmitry Tirski, Aleksandra L. Vasina, Vladimir A. Karpin, Jaana A. Kekkonen   +14 more
wiley   +1 more source

Biocontrol by a native hemiparasite: Rapid suppression of noxious invasive plants in a field experiment

Journal of Applied Ecology, EarlyView.
Melampyrum arvense was demonstrated as a biocontrol tool suitable for containing two harmful invasive species. After the suppression of the invaders, an additional introduction of native species by seeding or green‐hay transfer could facilitate community restoration. Abstract Alien plant invasions are a recognised threat to biodiversity.
Kateřina Knotková, Tamara Těšitelová, Adam Knotek, Irena Axmanová, Kryštof Chytrý, Helena Chytrá, Zuzana Plesková, Zdenka Preislerová, Jakub Těšitel   +8 more
wiley   +1 more source

CRITERIA FOR ASSESSING HEALTH CARE QUALITY: THE DIFFERENCES IN VIEWPOINTS

Juvenis Scientia, 2017
The article presents the results of a survey of patients in a therapeutic hospital, doctors, students of a medical university, conducted to identify the main quality criteria, and the main defects in the provision of medical care.
A. V. Yanichkina, V. A. Larionov, M. A. Shambatov, E. M. Vishneva   +3 more
doaj  

Everyday Life of Fine Lady in Province (by Material of Letters of 1840-1850-ies of Ye. A. Solomirskaya, Ural Factory Owner’s Wife)

Научный диалог, 2019
On the basis of archival materials - letters of a metropolitan fine lady, wife of co-owner of Sysertsky plants (Perm province) Yekaterina Aleksandrovna Solomirskaya, written in the middle of the 19th century from the province (Sysertsky plant or ...
M. B. Larionova
doaj   +1 more source