scholarly journals Plant Cryopreservation: A Look at the Present and the Future

Plants ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 2744
Author(s):  
Carla Benelli

Cryopreservation is known as an applied aspect of cryobiology or the study of life at low temperatures [...]

Author(s):  
Artem Mekhovych

The article considers the main problems affecting the development of international tourism and predicts the further development of the situation. The growing tourist flow has contributed to the intensification of entrepreneurship in all sectors of the economy, capitalization of assets, job creation, economic and social growth. In 2019, the global tourism industry provided about 330 million jobs, equivalent to 10.3% of total employment. The COVID-19 pandemic has caused an unprecedented crisis in the tourism industry. The flow of tourists in the world has decreased by about 65%. In January-September 2020 alone, the number of international revenues decreased by 70%.This has resulted in the loss of $ 730 billion and more than 120 million jobs. It is noted that in modern conditions there are possible directions of development of inbound and domestic tourism, which are an important factor influencing the economy, but the weakening of external restrictions and lack of competitive service in the Ukrainian tourism industry will contribute to further development of international tourism. Those countries in which tourism occupies a significant share in GDP, are interested in attracting tourists as soon as possible and are ready to promptly implement all necessary anti-epidemic measures in the tourist infrastructure. For the Ukrainian government today, such a strategy is not a priority. Based on this, it is proved that the essence of the scientific and applied aspect of managing the development of international tourism is based on the theory of large business cycles and the theory of prediction. It was emphasized that the world crises ended sooner or later and a new round of development began. The task of mastering the forces of socio-economic life and subordinating them to the conscious, planned leadership of the state, as well as constructive and continuous social dialogue between the government and social partners, is the next practical transformation of today. The program of conscious organizational and regulatory steps should be knowledge, anticipation and action plan. When developing an anti-crisis plan to overcome the impact of COVID-19 on the tourism sector in Ukraine, it is necessary to take into account the recommendations of the Global Crisis Committee on Tourism, namely: crisis management and job preservation; support for self-employed workers; providing incentives and implementing appropriate state policy in the field of international tourism. In predicting the future development of the situation, more attention should be paid to the role of the tourism sector in the country's economy and the achievement of sustainable development goals; develop plans for preparedness for the challenges of the future and use this opportunity to move to sustainable development of tourism facilities.


2014 ◽  
pp. 27-30
Author(s):  
Ivan Kalchev

A necessary background for clear outlined existing of each science in the so fast changing world is its permanent development in theoretical and applied aspect for solving today’s problems and visions in the future. In this respect for the modern sciences, more important role play theories, that not only generalize and explain the known facts and phenomena, but serve for predicting and achieving new levels of knowledge. In this paper the methods of teaching in the discipline Distributed Measurement Systems and in particular, the laboratory exercises carrying out by the students of Faculty of Automation and English Language Department of Engineering in Technical University of Sofia are presented.


2021 ◽  
pp. 120-126
Author(s):  
Maria STANKOVA ◽  
Simana MARKOVSKA

The current research opens a discussion about the status of the scientific periodicals in Bulgarian museums in view of the opportunities for its future enrichment in terms of content and fields of application. The focus is on presenting the initiatives of Bulgarian Regional Museums, with an accent on the Regional Historical Museum of Kyustendil. On the basis of a thorough review of its publications and their thematic range, the potential of museum periodicals has been explored in relation to the dual character of the museum – as an institution which collects, studies, keeps and preserves heritage, and at the same time presents it to various audiences. The main research goal has been set towards the identification of various practices for transforming the effect of the periodicals from purely scientific into scientific-and-applied, encouraging the promotion of the museum activities and improving the interaction with museum audiences. In terms of methodology, the team has worked with traditional approaches such as analysis and synthesis, comparison, abstraction, induction and deduction, summarization, and building presumptions. Conclusions have been drawn concerning the character of the periodicals published by Bulgarian museums, in view of involving more actively museum audiences in the future.


2013 ◽  
Vol 40 (10) ◽  
pp. 977 ◽  
Author(s):  
Tesfamichael H. Kebrom ◽  
Richard A. Richards

The number of tillers established in cereal crops far exceeds the number that end up being grain bearing at maturity. Improving the economy in tillering has been proposed to improve cereal yields in both favourable and unfavourable environments. The tiller inhibition mutant (tin) is potentially useful for breeding varieties with a greater economy of tillering. However, its tendency to stunting under long day and low temperatures has limited its use. Recently, the inhibition of tillering in tin has been linked to precocious development of solid basal internodes that compete for sucrose and possibly other resources with the growing tiller buds leading to their developmental arrest. Although the physiological basis of stunting in tin is unknown, both inhibition of tillering and stunting begin during the transition from vegetative to reproductive phase indicating a common physiological basis for both. In this review, we provide overall perspectives for the physiological basis of tiller inhibition and stunting in tin and suggest the direction of research in the future.


Author(s):  
D. H. Tantam

A brief examination of the effect of low temperatures on the physical and mechanical properties of engineering materials and cryogenic fluids is used to indicate their influence on the generation and removal of heat at the rubbing surface. A résumé is given of the techniques which have been used in practical applications including typical plain and roller bearing designs. The importance of safety and operational considerations is emphasized. A survey of advanced systems, particularly those associated with extremely low temperatures, is concluded by a prediction of new techniques which might be explored in the future.


1961 ◽  
Vol 13 ◽  
pp. 29-41
Author(s):  
Wm. Markowitz
Keyword(s):  

A symposium on the future of the International Latitude Service (I. L. S.) is to be held in Helsinki in July 1960. My report for the symposium consists of two parts. Part I, denoded (Mk I) was published [1] earlier in 1960 under the title “Latitude and Longitude, and the Secular Motion of the Pole”. Part II is the present paper, denoded (Mk II).


1978 ◽  
Vol 48 ◽  
pp. 387-388
Author(s):  
A. R. Klemola
Keyword(s):  

Second-epoch photographs have now been obtained for nearly 850 of the 1246 fields of the proper motion program with centers at declination -20° and northwards. For the sky at 0° and northward only 130 fields remain to be taken in the next year or two. The 270 southern fields with centers at -5° to -20° remain for the future.


Author(s):  
Godfrey C. Hoskins ◽  
Betty B. Hoskins

Metaphase chromosomes from human and mouse cells in vitro are isolated by micrurgy, fixed, and placed on grids for electron microscopy. Interpretations of electron micrographs by current methods indicate the following structural features.Chromosomal spindle fibrils about 200Å thick form fascicles about 600Å thick, wrapped by dense spiraling fibrils (DSF) less than 100Å thick as they near the kinomere. Such a fascicle joins the future daughter kinomere of each metaphase chromatid with those of adjacent non-homologous chromatids to either side. Thus, four fascicles (SF, 1-4) attach to each metaphase kinomere (K). It is thought that fascicles extend from the kinomere poleward, fray out to let chromosomal fibrils act as traction fibrils against polar fibrils, then regroup to join the adjacent kinomere.


Author(s):  
E. Knapek ◽  
H. Formanek ◽  
G. Lefranc ◽  
I. Dietrich

A few years ago results on cryoprotection of L-valine were reported, where the values of the critical fluence De i.e, the electron exposure which decreases the intensity of the diffraction reflections by a factor e, amounted to the order of 2000 + 1000 e/nm2. In the meantime a discrepancy arose, since several groups published De values between 100 e/nm2 and 1200 e/nm2 /1 - 4/. This disagreement and particularly the wide spread of the results induced us to investigate more thoroughly the behaviour of organic crystals at very low temperatures during electron irradiation.For this purpose large L-valine crystals with homogenuous thickness were deposited on holey carbon films, thin carbon films or Au-coated holey carbon films. These specimens were cooled down to nearly liquid helium temperature in an electron microscope with a superconducting lens system and irradiated with 200 keU-electrons. The progress of radiation damage under different preparation conditions has been observed with series of electron diffraction patterns and direct images of extinction contours.


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