scholarly journals European spruce (Picea abies L.) survival ability and morphological traits of seedlings treated with low-frequency electromagnetic field and planted with hydrogel application

2021 ◽  
Vol 25 ◽  
pp. 22-29
Author(s):  
A.I. Smirnov ◽  
◽  
V.F. Nikitin ◽  
A.A. Generalova ◽  
P.A. Aksenov ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Survival Rate ◽  
Picea Abies ◽  
Morphological Traits ◽  
Low Frequency ◽  
Anatomical Structure ◽  
Biometric Analysis ◽  
And Control ◽  
Positive Effect ◽  
Control Samples

The results of the study indicate a clear positive effect of the low-frequency electromagnetic field and hydrogel on the increase in the survival rate of experimental samples of European spruce seedlings (Picea abies L.) treated with BOT technology in relation to the control samples. The results of comparative biometric analysis are presented, which prove the effectiveness of methods of processing spruce seedlings with a low-frequency electromagnetic field and applying hydrogel to the soil. The histometric analysis of experimental and control samples of European Spruce seedlings confirmed the positive effect of the low-frequency electromagnetic field on the anatomical structure of the xylem of seedlings treated using the BOT technology.

scholarly journals Common pine (Pinus sylvestris L.) survival abilitty and seedlings growth after treatment with low-frequency electromagnetic field

2021 ◽  
Vol 25 (2) ◽  
pp. 25-34
Author(s):  
A.I. Smirnov ◽  
◽  
F.S. Orlov ◽  
P.A. Aksenov ◽  
S.B. Vasil’ev ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Survival Rate ◽  
Scots Pine ◽  
Low Frequency ◽  
Anatomical Structure ◽  
Biometric Parameters ◽  
Pine Seedlings ◽  
Growth Increase ◽  
Physical Impact ◽  
Positive Effect

The results of studies carried out in the Pravdinsky nursery of the Pushkin Forestry Technical Colledge in the Moscow Region and in the laboratory of the department «Forest cultures, selection and dendrology» at the ВMSTU (Mytishchi branch) since May 2015 untill September 2019 are presented. The results of the study confirmed the significant advantage of experimental indicators over the control. Thus, the treatment of seeds and two-year-old seedlings of Scots pine with a low-frequency electromagnetic field using the POSEP technology, in general had a positive effect not only on their survival rate and biometric parameters, but also on their anatomical structure. Based on the results of the studies, it can be ststed that the POSEP technology is an effective method of physical impact on the survival rate and growth increase of Scots pine seedlings.

scholarly journals Low-frequency electromagnetic field and hydrogel to increase survival rate and growth of European spruce (Picea abies L.) seedlings

2021 ◽  
Vol 25 (1) ◽  
pp. 45-52
Author(s):  
A.I. Smirnov ◽  
◽  
F.S. Orlov ◽  
P.A. Aksenov ◽  
V.F. Nikitin ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Survival Rate ◽  
Picea Abies ◽  
Cross Sections ◽  
Low Frequency ◽  
Pine Seedlings ◽  
Frequency Generator ◽  
Positive Effect ◽  
Hydrogel Polymer ◽  
Increase Survival Rate

This paper presents the results of a study that was conducted in the Sergiev Posad forestry of the Moscow region forestry Department with the participation of the laboratory of the Department of Forest crops, breeding and dendrology of the BMSTU (Mytishchi branch). This study shows the technology of planting European (Picea abies L.), seedlings in culture, which can significantly increase the survival rate of experimental samples and improve their biometric characteristics: height, diameter of the root neck, weight, and also the anatomical structure of seedlings. The experiments were performed using a low-frequency generator «Rost-Active», the author’s technology pre-sowing treatment of seeds and seedlings by an electromagnetic field, hydrogel (polymer water-retaining agent) and a method of histometric analysis of cross sections of control and experimental stems of European spruce seedlings. The results of the study indicate a clear positive effect of electromagnetic field and hydrogel on the increase in survival of experimental samples of seedlings of common European spruce in relation to the control. Also, the results of comparative histometric analysis indicate the effectiveness of methods for treating pine seedlings with low-frequency EMF and applying hydrogel to the soil.

scholarly journals Effect of pH and water irradiation with the electromagnetic field on the gelation of gelatin solutions

2020 ◽  
Vol 100 (4) ◽  
pp. 96-103
Author(s):  
I.E. Stas’ ◽  
◽  
S.S. Pavlova ◽  
Keyword(s):  
Electromagnetic Field ◽  
Solid State ◽  
Isoelectric Point ◽  
Physical State ◽  
Relative Viscosity ◽  
Gelatin Solution ◽  
Effect Of Ph ◽  
Structured System ◽  
And Control ◽  
Control Samples

The rate of gelation was determined from the curve slope of the dependence of the gelatin solution relative viscosity on time at different pH. It was found that slow gelation of 2 % gelatin solution occurs at T = 293 K, and the degree of fluidity significantly depends on рН. The most stable jellies are formed at the isoelectric point (рН = 4.7). There are significant differences in the physical state of jellies prepared on irradiated water and control samples. Prepared on unirradiated water jellies are more mobile and retain fluidity at T = 293 K regardless of рН. There is a partial or full melting of the jellies with the increase in temperature at 297 K; however solid state remains for irradiated systems at pH = 4 and 4.7. It was shown that the viscosity of the ir-radiated solution and the rate of its increase are higher in comparison with the control samples at all pH val-ues except рН = 2. The observed phenomenon can be caused by the weakening of the hydration of polymer macromolecules in the activated water, which facilitates their association and the formation of a structured system.

scholarly journals The Effectiveness of Low Frequency Electromagnetic Field and Hydrogel Influence on Survival Rate and Growth of Red Oak (Quercus rubra L.) Annual Seedlings

2020 ◽  
pp. 81-89
Author(s):  
A.I. Smirnov ◽  
◽  
F.S. Orlov ◽  
P.A. Aksenov ◽  
Yu.V. Yaskov ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Survival Rate ◽  
Cross Sections ◽  
Low Frequency ◽  
Red Oak ◽  
Planting Material ◽  
Open Ground ◽  
Forest Nurseries ◽  
One Year ◽  
Oak Seedlings

This work presents the results of a research that was conducted in the Donskoy Leskhoz nursery of the Forestry Department of the Lipetsk Region. The purpose of the research is to determine the effectiveness of the influence of a low-frequency electromagnetic field and the hydrogel “Evabiona” on the survival rate of red oak annual seedlings grown in open ground of the nursery. This research presents the technology for creating red oak planting material with increased survival indices of test samples and their biometric parameters: seedling height, seedling diameter at a root collar, weight of roots and aboveground part in the air-dry condition after drying for 15 days. Treatment of red oak one-year old seedlings with a low frequency electromagnetic field was carried out according to the author’s technology POSEP – pre-sowing treatment of seeds and seedlings with an electromagnetic field. The hydrogel, a polymer water-retaining agent that absorbs and retains a large amount of moisture in the rhizosphere of plants, was applied to soil in the experimental research. The ability of the hydrogel granules to swell-compression improves the structure and drainage of soils, boosting the conditions of aeration and filtration of water, and maintains its waterretaining properties for several years. The research results indicate a clear positive effect of treatment with a low-frequency electromagnetic field and the hydrogel, as there was a significant increase in the survival rate of the test samples of oak seedlings in relation to the control samples. Also within the framework of the research a comparative histometric analysis of cross sections of control and test stems of oak seedlings was carried out late in the growing season at the laboratory of the Department of Forest Crops, Selection and Dendrology of the Mytishchi Branch of the Bauman Moscow State Technical University. The results of this research showed that a low-frequency electromagnetic field and the hydrogel can influence on the anatomical structure of seedlings, improving their quality characteristics. Thus, pre-sowing treatment of oak seedlings with a low-frequency electromagnetic field and the use of the hydrogel showed the effectiveness of these techniques in increasing the survival rate of seedlings and obtaining high-quality planting material of red oak in forest nurseries.

Comparison of high- and low-frequency electromagnetic field analysis

1993 ◽  
Vol 3 (3) ◽  
pp. 363-371 ◽  
Author(s):  
A. Konrad ◽  
I. A. Tsukerman
Keyword(s):  
Electromagnetic Field ◽  
Low Frequency ◽  
Field Analysis

Changes in the Population Density of Pathogenic Microorganisms in Response to the Allelopathic Effect of Thypha Latifolia

2014 ◽  
Vol 1 (1) ◽  
pp. 31-36 ◽  
Author(s):  
O. Zhukorskiy ◽  
O. Gulay ◽  
V. Gulay ◽  
N. Tkachuk
Keyword(s):  
Cell Density ◽  
Allelopathic Effect ◽  
Pathogenic Microorganisms ◽  
Sterile Water ◽  
Erysipelothrix Rhusiopathiae ◽  
Pathogenic Leptospira ◽  
Favorable Conditions ◽  
And Control ◽  
The Impact ◽  
Control Samples

Aim. To determine the response of the populations of Erysipelothrix rhusiopathiae and Leptospira interrogans pathogenic microorganisms to the impact of broadleaf cattail (Thypha latifolia) root diffusates. Methods. Aqueous solutions of T. latifolia root diffusates were sterilized by vacuum fi ltration through the fi lters with 0.2-micron pore diameter. The experimental samples contained cattail secretions, sterile water, and cultures of E. rhusiopathiae or L. interrogans. The same amount of sterile water, as in the experimental samples, was used for the purpose of control, and the same quantity of microbial cultures was added in it. After exposure, the density of cells in the experimental and control samples was determined. Results. Root diffusates of T. latifolia caused an increase in cell density in the populations of E. rhusiopathiae throughout the whole range of the studied dilutions (1:10–1:10000). In the populations of the 6 studied serological variants of L. interrogans spirochetes (pomona, grippotyphosa, copenhageni, kabura, tarassovi, canicola), the action of broadleaf cattail root diffusates caused the decrease in cell density. A stimulatory effect was marked in the experimental samples of the pollonica serological variant of leptospira. Conclusions. The populations of E. rhusiopathiae and L. interrogans pathogenic microorganisms respond to the allelopathic effect of Thypha latifolia by changing the cell density. The obtained results provide the background to assume that broadleaf cattail thickets create favorable conditions for the existence of E. rhusiopathiae pathogen bacteria. The reduced cell density of L. interrogans in the experimental samples compared to the control samples observed under the infl uence of T. latifolia root diffusates suggests that reservoirs with broadleaf cattail thickets are marked by the unfavorable conditions for the existence of pathogenic leptospira (except L. pollonica).

scholarly journals The Anti-PD-1/PD-L1 Immunotherapy for Gastric Esophageal Cancer: A Systematic Review and Meta-Analysis and Literature Review

2021 ◽  
Vol 28 ◽  
pp. 107327482199743
Author(s):  
Ke Chen ◽  
Xiao Wang ◽  
Liu Yang ◽  
Zheling Chen
Keyword(s):  
Overall Survival ◽  
Esophageal Cancer ◽  
Survival Rate ◽  
Meta Analysis ◽  
Response Rates ◽  
Control Group ◽  
Term Survival ◽  
Long Term Survival ◽  
And Control

Background: Treatment options for advanced gastric esophageal cancer are quite limited. Chemotherapy is unavoidable at certain stages, and research on targeted therapies has mostly failed. The advent of immunotherapy has brought hope for the treatment of advanced gastric esophageal cancer. The aim of the study was to analyze the safety of anti-PD-1/PD-L1 immunotherapy and the long-term survival of patients who were diagnosed as gastric esophageal cancer and received anti-PD-1/PD-L1 immunotherapy. Method: Studies on anti-PD-1/PD-L1 immunotherapy of advanced gastric esophageal cancer published before February 1, 2020 were searched online. The survival (e.g. 6-month overall survival, 12-month overall survival (OS), progression-free survival (PFS), objective response rates (ORR)) and adverse effects of immunotherapy were compared to that of control therapy (physician’s choice of therapy). Results: After screening 185 studies, 4 comparative cohort studies which reported the long-term survival of patients receiving immunotherapy were included. Compared to control group, the 12-month survival (OR = 1.67, 95% CI: 1.31 to 2.12, P < 0.0001) and 18-month survival (OR = 1.98, 95% CI: 1.39 to 2.81, P = 0.0001) were significantly longer in immunotherapy group. The 3-month survival rate (OR = 1.05, 95% CI: 0.36 to 3.06, P = 0.92) and 18-month survival rate (OR = 1.44, 95% CI: 0.98 to 2.12, P = 0.07) were not significantly different between immunotherapy group and control group. The ORR were not significantly different between immunotherapy group and control group (OR = 1.54, 95% CI: 0.65 to 3.66, P = 0.01). Meta-analysis pointed out that in the PD-L1 CPS ≥10 sub group population, the immunotherapy could obviously benefit the patients in tumor response rates (OR = 3.80, 95% CI: 1.89 to 7.61, P = 0.0002). Conclusion: For the treatment of advanced gastric esophageal cancer, the therapeutic efficacy of anti-PD-1/PD-L1 immunotherapy was superior to that of chemotherapy or palliative care.

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