435 research outputs found
Plotnikov I.S., Large saline lakes of former USSR: a summary review. Hydrobiologia 267
No full textAbstract Seven of the largest lakes in central Asia (former USSR) are saline: Caspian Sea, Aral Sea, lakes Balkhash, Issyk-Kul, the Chany complex, Alakul and Tengiz. They range in salinity from sometimes < 3 g l -1 t o l 9 g l -1 . The paper provides a summary review of their major physico-chemical and biological features. Several are threatened by activities in their drainage basins, particularly diversion of inflowing waters
The core microbiome of sessile ciliate Stentor coeruleus is not shaped by the environment
Get PDFMicrobiomes of multicellular organisms are one of the hottest topics in microbiology and physiology, while only few studies addressed bacterial communities associated with protists. Protists are widespread in all environments and can be colonized by plethora of different bacteria, including also human pathogens. The aim of this study was to characterize the prokaryotic community associated with the sessile ciliate Stentor coeruleus. 16S rRNA gene metabarcoding was performed on single cells of S. coeruleus and on their environment, water from the sewage stream. Our results showed that the prokaryotic community composition differed significantly between Stentor cells and their environment. The core microbiome common for all ciliate specimens analyzed could be defined, and it was composed mainly by representatives of bacterial genera which include also potential human pathogens and commensals, such as Neisseria, Streptococcus, Capnocytophaga, Porphyromonas. Numerous 16S rRNA gene contigs belonged to endosymbiont “Candidatus Megaira polyxenophila”. Our data suggest that each ciliate cell can be considered as an ecological microniche harboring diverse prokaryotic organisms. Possible benefits for persistence and transmission in nature for bacteria associated with protists are discussed. Our results support the hypothesis that ciliates attract potentially pathogenic bacteria and play the role of natural reservoirs for them
The T1 state of p-nitroaniline and related molecules: a CNDO/S study
No full textThe nature of the lowest energy triplet state (T1) of p-nitroaniline (PNA), N,N-dimethyl-p-nitroaniline (DMPNA) and nitrobenzene (NB) is reexamd. using the semiempirical CNDO/S-CI method with selected parameter options. In the case of the unperturbed mols. the short-axis polarized p* A- singlet excitation. Computations suggest, however, that polar solvents strongly stabilize the PNA and DMPNA p* <- p charge-transfer triplet relative to other excitations, whereas specific solvent hydrogen-bonded interactions stabilize the p* <- n(s) triplet of NB below those of p* <- p character. These assignments allow a rationalization of phosphorescence lifetime data, Tn <- T1 absorption measurements and relative photochem. behavior
The microstructure and magnetic properties of the Fe-Cu-Nb-Si-B finemets with different copper content
No full textCrystallization processes in an amorphous Co-Fe-Cr-Si-B alloy under isothermal annealing
No full textFactors Associated with In-Hospital Mortality in Elderly Internal Medicine Patients with Nasogastric Tube Feeding
No full textGalina Plotnikov,1,2 Saleh Sharif,2,3 Gleb Buturlin,2 Inbal Segal,1 Oleg Gorelik,2 Nadya Kagansky2,4 1Geriatric Assessment Unit, Yitzhak Shamir Medical Center, Zerifin, 7033001, Israel; 2Sackler Faculty of Medicine, Tel Aviv University, Ramat Aviv, Israel; 3Department of Internal Medicine C, Yitzhak Shamir Medical Center, Zerifin, 7033001, Israel; 4Shmuel Harofe Geriatric Medical Center, Beer Yaakov, IsraelCorrespondence: Galina Plotnikov, Geriatric Assessment Unit, Yitzhak Shamir Medical Center, Zerifin, 7033001, Israel, Tel +972-8-9542271, Fax +972-8-9779597, Email [email protected]: To evaluate demographic, clinical, and laboratory variables, and their associations with in-hospital mortality, among elderly internal medicine patients with nasogastric tube (NGT) feeding.Patients and Methods: Demographic, clinical, and laboratory data were collected retrospectively for 129 patients aged ≥ 80 years who initiated NGT feeding during their hospitalization in internal medicine wards. The data were compared between survivors and non-survivors. Multivariate logistic regressions were performed to identify the variables most significantly associated with in-hospital mortality.Results: The in-hospital mortality rate was 60.5%. Compared to survivors, non-survivors more often presented with pressure sores (P=0.005) and lymphopenia (P< 0.001), were more often treated with invasive mechanical ventilation (P< 0.001), and less often underwent geriatric assessment (P< 0.001). Non-survivors demonstrated higher mean levels of C-reactive protein, and lower mean values of serum cholesterol, triglycerides, total protein, and albumin (P< 0.001 for all comparisons). On multivariate analysis, the following variables were most significantly associated with in-hospital mortality in the entire cohort: the presence of pressure sores (odds ratio [OR], 4.34; 95% confidence interval [CI], 1.68– 11.48; P=0.003) and lymphopenia (OR, 4.09; 95% CI, 1.51– 11.08; P=0.006), and serum cholesterol (OR, 0.98; 95% CI, 0.96– 0.99; P=0.003).Conclusion: Among elderly acutely ill patients who initiated NGT feeding during hospitalization, in-hospital mortality was extremely high. The factors most strongly associated with in-hospital mortality were the presence of pressure sores and lymphopenia, and lower serum cholesterol levels. These findings may provide useful prognostic information for decision-making regarding initiation of NGT feeding in elderly hospitalized patients.Keywords: aging, enteral feeding, hospitalization, prognosi
E. G. Liberman: Right and Wrong
No full textA great many concrete proposals have been made in the course of our discussion, and among these were recommendations diametrically opposite to Comrade Liberman's views. Apparently it is necessary to select those of the recommendations which conform in the greatest degree to the present stage of development of our national economy and provide a scientific grounding for them. All the proposals can be subdivided approximately into three categories: the improvement of planning of enterprises' production operations, the determination of criteria for the assessment of their work, and the improvement of the bonus system for workers. In his speech at the 22nd CPSU Congress, Comrade N. S. Khrushchev said: "Life itself calls for scientific grounding and economic calculations of a new, far higher order in the fields of planning and management." That is why the proposals made should, first of all, be assessed from the standpoint of scientific grounding and economic calculations.
Endoscopy-assisted dilatational tracheostomy in patients with COVID-19
No full textOBJECTIVE: To summarize an experience of endoscopy-assisted dilatational tracheostomies in patients with COVID-19. MATERIAL AND METHODS: There were 31 endoscopy-assisted dilatational tracheostomies in patients with COVID-19 for the period from April 17 to June 10, 2020 (11 women and 19 men). Mean age of patients was 66.7 years (range 48-87). Tracheostomy was performed using Ciaglia (22) and Griggs (9) techniques. All procedures were carried out at the intensive care unit in elective fashion. RESULTS: Tracheostomy was performed in 19.8% of ICU patients or 36.9% of all patients on mechanical ventilation within 6.5±2.5 days [min 3, max 11]. There were 22 survivors with tracheostomy (70.9%) that is comparable with survival of patients without mechanical ventilation (79.7%) and slightly higher than in patients on ventilation without tracheostomy (65.4%). No complications during the procedure were noted. CONCLUSION: Endoscopy-assisted dilatational tracheostomy is preferred for prolonged mechanical ventilation, including patients with COVID-19. The undeniable advantages of this operation are fewer intraoperative complications due to endoscopic control, and lower risk of tracheal strictures
Semiconductors V. 36, I. 08
No full textdc.description[en_US]Semiconductors -- August 2002
Volume 36, Issue 8, pp. 837-951
ATOMIC STRUCTURE AND NONELECTRONIC PROPERTIES OF SEMICONDUCTORS
Measurements of Parameters of the Low-Temperature Molecular-Beam Epitaxy of GaAs
V. V. Preobrazhenskii, M. A. Putyato, and B. R. Semyagin
pp. 837-840 Full Text: PDF (60 kB)
Threshold of Inelastic Strain Formation in Si and GaAs Surface Layers under Multiple Pulsed Laser Irradiation
S. V. Vintsents, A. V. Zoteev, and G. S. Plotnikov
pp. 841-844 Full Text: PDF (58 kB)
Dissociation Energies of a CiCs Complex and the A Center in Silicon
N. I. Boyarkina, S. A. Smagulova, and A. A. Artem'ev
pp. 845-847 Full Text: PDF (46 kB)
ATOMIC STRUCTURE AND NONELECTRONIC PROPERTIES
Initial Stages of Growth of Diamond Island Films on Crystalline Silicon
N. A. Feoktistov, V. V. Afanas'ev, V. G. Golubev, S. A. Grudinkin, S. A. Kukushkin, and V. G. Melekhin
pp. 848-851 Full Text: PDF (141 kB)
ELECTRONIC AND OPTICAL PROPERTIES OF SEMICONDUCTORS
Local Structure of Zinc Impurity Centers in Lead Chalcogenides and Pb1 ��� xSnxTe Solid Solutions
S. A. Nemov and N. P. Seregin
pp. 852-854 Full Text: PDF (100 kB)
Influence of Tellurium Impurity on the Properties of Ga1 ��� XInXAsYSb1 ��� Y (X > 0.22) Solid Solutions
T. I. Voronina, T. S. Lagunova, E. V. Kunitsyna, Ya. A. Parkhomenko, M. A. Sipovskaya, and Yu. P. Yakovlev
pp. 855-862 Full Text: PDF (104 kB)
Optical Properties of Bulk and Epitaxial Unordered GaxIn1 ��� xP Semiconductor Alloys
Ya. I. Vyklyuk, V. G. Deibuk, and S. V. Zolotarev
pp. 863-868 Full Text: PDF (89 kB)
Electrical and Thermoelectric Properties of p-Ag2Te
F. F. Aliev, E. M. Kerimova, and S. A. Aliev
pp. 869-873 Full Text: PDF (74 kB)
Photoconductivity of Coarse-Grained CdTe Polycrystals
S. A. Medvedev, Yu. V. Klevkov, S. A. Kolosov, V. S. Krivobok, and A. F. Plotnikov
pp. 874-877 Full Text: PDF (51 kB)
Time-Resolved Photoluminescence of Polycrystalline GaN Layers on Metal Substrates
A. V. Andrianov, K. Yamada, H. Tampo, H. Asahi, V. Yu. Nekrasov, Z. N. Petrovskaya, O. M. Sreseli, and N. N. Zinov'ev
pp. 878-882 Full Text: PDF (66 kB)
SEMICONDUCTOR STRUCTURES, INTERFACES, AND SURFACES
Low-Threshold Defect Formation and Modification of Ge Surface Layer under Elastic and Elastoplastic Pulsed Laser Effects
S. V. Vintsents, V. B. Zaitsev, A. V. Zoteev, G. S. Plotnikov, A. I. Rodionov, and A. V. Chervyakov
pp. 883-888 Full Text: PDF (79 kB)
Electron Tunneling through a Double Barrier in a Reverse-Biased Metal���Oxide���Silicon Structure
G. G. Kareva, M. I. Vexler, I. V. Grekhov, and A. F. Shulekin
pp. 889-894 Full Text: PDF (89 kB)
LOW-DIMENSIONAL SYSTEMS
Structure of Heterointerfaces and Photoluminescence Properties of GaAs/AlAs Superlattices Grown on (311)A and (311)B Surfaces: Comparative Analysis
G. A. Lyubas, N. N. Ledentsov, D. Litvinov, B. R. Semyagin, I. P. Soshnikov, V. M. Ustinov, V. V. Bolotov, and D. Gerthsen
pp. 895-898 Full Text: PDF (138 kB)
Wavelength of Emission from InGaAsN Quantum Wells as a Function of Composition of the Quaternary Compound
A. E. Zhukov, A. R. Kovsh, E. S. Semenova, V. M. Ustinov, L. Wei, J.-S. Wang, and J. Y. Chi
pp. 899-902 Full Text: PDF (66 kB)
Two-Dimensional p���n Junction under Equilibrium Conditions
A. Sh. Achoyan, A. �. Yesayan, �. M. Kazaryan, and S. G. Petrosyan
pp. 903-907 Full Text: PDF (70 kB)
Calculations of the Charge-Carrier Mobility and the Thermoelectric Figure of Merit for Multiple-Quantum-Well Structures
D. A. Pshenai-Severin and Yu. I. Ravich
pp. 908-915 Full Text: PDF (91 kB)
Nonlinear Response and Nonlinear Coherent Generation in Resonant-Tunneling Diode in a Broad Frequency Range
V. F. Elesin, I. Yu. Kateev, and A. I. Podlivaev
pp. 916-920 Full Text: PDF (61 kB)
Anomalies of the Fractional Quantum Hall Effect in a Wide Ballistic Wire
Z. D. Kvon, E. B. Olshanetsky, A. E. Plotnikov, A. I. Toropov, and J. C. Portal
pp. 921-923 Full Text: PDF (46 kB)
Special Features of Electrical Conductivity in a Parabolic Quantum Well in a Magnetic Field
E. P. Sinyavskii and R. A. Khamidullin
pp. 924-928 Full Text: PDF (59 kB)
Manifestation of A(+) Centers in the Luminescence of Two-Dimensional GaAs/AlGaAs Structures
Yu. L. Ivanov, N. V. Agrinskaya, P. V. Petrov, V. M. Ustinov, and G. �. Tsyrlin
pp. 929-931 Full Text: PDF (43 kB)
One-Dimensional Photonic Crystal Obtained by Vertical Anisotropic Etching of Silicon
V. A. Tolmachev, L. S. Granitsyna, E. N. Vlasova, B. Z. Volchek, A. V. Nashchekin, A. D. Remenyuk, and E. V. Astrova
pp. 932-935 Full Text: PDF (263 kB)
AMORPHOUS, VITREOUS, AND POROUS SEMICONDUCTORS
Gamma-Irradiation-Induced Metastable States of Undoped Amorphous Hydrogenated Silicon
M. S. Ablova, G. S. Kulikov, and S. K. Persheev
pp. 936-940 Full Text: PDF (73 kB)
Fabrication and Properties of Amorphous Hydrogenated Boron Carbide Films
A. S. Anan'ev, O. I. Kon'kov, V. M. Lebedev, A. N. Novokhatski, E. I. Terukov, and I. N. Trapeznikova
pp. 941-943 Full Text: PDF (47 kB)
PHYSICS OF SEMICONDUCTOR DEVICES
Lattice-Matched GaInPAsSb/InAs Structures for Devices of Infrared Optoelectronics
M. Aidaraliev, N. V. Zotova, S. A. Karandashev, B. A. Matveev, M. A. Remennyi, N. M. Stus', G. N. Talalakin, V. V. Shustov, V. V. Kuznetsov, and E. A. Kognovitskaya
pp. 944-949 Full Text: PDF (71 kB)
PERSONALIA
Viktor Il'ich Fistul' (on his 75th birthday)
pp. 950-951 Full Text: PDF (71 kB)dc.description.contributor[en_US]dc.description.contributor[en_US
Semiconductors V. 36, I. 08
No full textSemiconductors -- August 2002
Volume 36, Issue 8, pp. 837-951
ATOMIC STRUCTURE AND NONELECTRONIC PROPERTIES OF SEMICONDUCTORS
Measurements of Parameters of the Low-Temperature Molecular-Beam Epitaxy of GaAs
V. V. Preobrazhenskii, M. A. Putyato, and B. R. Semyagin
pp. 837-840 Full Text: PDF (60 kB)
Threshold of Inelastic Strain Formation in Si and GaAs Surface Layers under Multiple Pulsed Laser Irradiation
S. V. Vintsents, A. V. Zoteev, and G. S. Plotnikov
pp. 841-844 Full Text: PDF (58 kB)
Dissociation Energies of a CiCs Complex and the A Center in Silicon
N. I. Boyarkina, S. A. Smagulova, and A. A. Artem'ev
pp. 845-847 Full Text: PDF (46 kB)
ATOMIC STRUCTURE AND NONELECTRONIC PROPERTIES
Initial Stages of Growth of Diamond Island Films on Crystalline Silicon
N. A. Feoktistov, V. V. Afanas'ev, V. G. Golubev, S. A. Grudinkin, S. A. Kukushkin, and V. G. Melekhin
pp. 848-851 Full Text: PDF (141 kB)
ELECTRONIC AND OPTICAL PROPERTIES OF SEMICONDUCTORS
Local Structure of Zinc Impurity Centers in Lead Chalcogenides and Pb1 – xSnxTe Solid Solutions
S. A. Nemov and N. P. Seregin
pp. 852-854 Full Text: PDF (100 kB)
Influence of Tellurium Impurity on the Properties of Ga1 – XInXAsYSb1 – Y (X > 0.22) Solid Solutions
T. I. Voronina, T. S. Lagunova, E. V. Kunitsyna, Ya. A. Parkhomenko, M. A. Sipovskaya, and Yu. P. Yakovlev
pp. 855-862 Full Text: PDF (104 kB)
Optical Properties of Bulk and Epitaxial Unordered GaxIn1 – xP Semiconductor Alloys
Ya. I. Vyklyuk, V. G. Deibuk, and S. V. Zolotarev
pp. 863-868 Full Text: PDF (89 kB)
Electrical and Thermoelectric Properties of p-Ag2Te
F. F. Aliev, E. M. Kerimova, and S. A. Aliev
pp. 869-873 Full Text: PDF (74 kB)
Photoconductivity of Coarse-Grained CdTe Polycrystals
S. A. Medvedev, Yu. V. Klevkov, S. A. Kolosov, V. S. Krivobok, and A. F. Plotnikov
pp. 874-877 Full Text: PDF (51 kB)
Time-Resolved Photoluminescence of Polycrystalline GaN Layers on Metal Substrates
A. V. Andrianov, K. Yamada, H. Tampo, H. Asahi, V. Yu. Nekrasov, Z. N. Petrovskaya, O. M. Sreseli, and N. N. Zinov'ev
pp. 878-882 Full Text: PDF (66 kB)
SEMICONDUCTOR STRUCTURES, INTERFACES, AND SURFACES
Low-Threshold Defect Formation and Modification of Ge Surface Layer under Elastic and Elastoplastic Pulsed Laser Effects
S. V. Vintsents, V. B. Zaitsev, A. V. Zoteev, G. S. Plotnikov, A. I. Rodionov, and A. V. Chervyakov
pp. 883-888 Full Text: PDF (79 kB)
Electron Tunneling through a Double Barrier in a Reverse-Biased Metal–Oxide–Silicon Structure
G. G. Kareva, M. I. Vexler, I. V. Grekhov, and A. F. Shulekin
pp. 889-894 Full Text: PDF (89 kB)
LOW-DIMENSIONAL SYSTEMS
Structure of Heterointerfaces and Photoluminescence Properties of GaAs/AlAs Superlattices Grown on (311)A and (311)B Surfaces: Comparative Analysis
G. A. Lyubas, N. N. Ledentsov, D. Litvinov, B. R. Semyagin, I. P. Soshnikov, V. M. Ustinov, V. V. Bolotov, and D. Gerthsen
pp. 895-898 Full Text: PDF (138 kB)
Wavelength of Emission from InGaAsN Quantum Wells as a Function of Composition of the Quaternary Compound
A. E. Zhukov, A. R. Kovsh, E. S. Semenova, V. M. Ustinov, L. Wei, J.-S. Wang, and J. Y. Chi
pp. 899-902 Full Text: PDF (66 kB)
Two-Dimensional p–n Junction under Equilibrium Conditions
A. Sh. Achoyan, A. É. Yesayan, É. M. Kazaryan, and S. G. Petrosyan
pp. 903-907 Full Text: PDF (70 kB)
Calculations of the Charge-Carrier Mobility and the Thermoelectric Figure of Merit for Multiple-Quantum-Well Structures
D. A. Pshenai-Severin and Yu. I. Ravich
pp. 908-915 Full Text: PDF (91 kB)
Nonlinear Response and Nonlinear Coherent Generation in Resonant-Tunneling Diode in a Broad Frequency Range
V. F. Elesin, I. Yu. Kateev, and A. I. Podlivaev
pp. 916-920 Full Text: PDF (61 kB)
Anomalies of the Fractional Quantum Hall Effect in a Wide Ballistic Wire
Z. D. Kvon, E. B. Olshanetsky, A. E. Plotnikov, A. I. Toropov, and J. C. Portal
pp. 921-923 Full Text: PDF (46 kB)
Special Features of Electrical Conductivity in a Parabolic Quantum Well in a Magnetic Field
E. P. Sinyavskii and R. A. Khamidullin
pp. 924-928 Full Text: PDF (59 kB)
Manifestation of A(+) Centers in the Luminescence of Two-Dimensional GaAs/AlGaAs Structures
Yu. L. Ivanov, N. V. Agrinskaya, P. V. Petrov, V. M. Ustinov, and G. É. Tsyrlin
pp. 929-931 Full Text: PDF (43 kB)
One-Dimensional Photonic Crystal Obtained by Vertical Anisotropic Etching of Silicon
V. A. Tolmachev, L. S. Granitsyna, E. N. Vlasova, B. Z. Volchek, A. V. Nashchekin, A. D. Remenyuk, and E. V. Astrova
pp. 932-935 Full Text: PDF (263 kB)
AMORPHOUS, VITREOUS, AND POROUS SEMICONDUCTORS
Gamma-Irradiation-Induced Metastable States of Undoped Amorphous Hydrogenated Silicon
M. S. Ablova, G. S. Kulikov, and S. K. Persheev
pp. 936-940 Full Text: PDF (73 kB)
Fabrication and Properties of Amorphous Hydrogenated Boron Carbide Films
A. S. Anan'ev, O. I. Kon'kov, V. M. Lebedev, A. N. Novokhatski, E. I. Terukov, and I. N. Trapeznikova
pp. 941-943 Full Text: PDF (47 kB)
PHYSICS OF SEMICONDUCTOR DEVICES
Lattice-Matched GaInPAsSb/InAs Structures for Devices of Infrared Optoelectronics
M. Aidaraliev, N. V. Zotova, S. A. Karandashev, B. A. Matveev, M. A. Remennyi, N. M. Stus', G. N. Talalakin, V. V. Shustov, V. V. Kuznetsov, and E. A. Kognovitskaya
pp. 944-949 Full Text: PDF (71 kB)
PERSONALIA
Viktor Il'ich Fistul' (on his 75th birthday)
pp. 950-951 Full Text: PDF (71 kB)Archived web conten
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