Analytical modelling cargoes displacement in wagon and tension in fastening

The article deals with the conclusions of analytical modeling cargoes displacement relative wagon and tension in fastening on exposure to spatial system of forces

The Expression of width and Colour Plane in the Sur Karakul Lambs of Different Colours

The results of research into similar and distinctive features in the study of curl breadth and color consistency of karakul lambs of harsh diamond and silver coloration are presented in this article

Method of luminescent analysis of the state of photosynthetic apparatus of plants

Photosynthetic apparatus and its reaction to changes in external conditions carry information about the state of the plant. Thus, under different lighting conditions, as well as with changes in nutrition and microclimate conditions, the amount and composition of chlorophyll in plant cells changes, which will lead to changes in the optical parameters of plant chlorophyll. You can track the state of the plant by changing the parameters of chlorophyll fluorescence. To monitor the state of the photosynthetic apparatus, the method of analysis of induction curves of variable fluorescence is used. The purpose of this article is to design a research facility for testing the technique of fluorescent analysis and further accumulation of statistical data on the dependence of fluorescence characteristics on lighting parameters

ПІДГОТОВКА МАЙБУТНІХ УЧИТЕЛІВ І РЕАЛІЗАЦІЯ ІНДИВІДУАЛЬНОГО ПІДХОДУ ДО УЧНІВ НА УРОКАХ ТРУДОВОГО НАВЧАННЯ ТА ТЕХНОЛОГІЙ

Relevancy of training future teachers of labor training and technologies for implementation of individual approach to students’ learning has been substantiated. Complex of actions to be taken into account for the successful execution of individual approach to the students' learning has been determined: identification of the basic individual peculiarities of students, which are manifested while studying particular subject; considering age features, defining students’ individual characteristics in order to take them into account in the process of learning, grouping students, developing differentiated tasks for students of different groups.Training of future teachers of labor training and technologies for individual approach implementation in accordance with stages and with gradual complication of tasks has been suggested. Notional stages of students’ training for the implementation of individual approach have been determined: initial understanding of the role of individual approach to students; learning of the essence of individualization and differentiation of training, creation of differentiated tasks; development of creative tasks taking into account individual and age features; formation of professional competencies in future teachers and consolidation of the existing knowledge and skills in implementing individual approach to students; improving the readiness of students to implementation of individual approach. A list of theoretical questions for students in order to understand the essence and peculiarities of implementation of individual approach to teaching students has been suggested. Requirements to the tasks on training future teachers for implementation of individual approach in teaching students in accordance with each stage have been developed.Обґрунтовано доцільність підготовки майбутніх учителів трудового навчання та технологій до реалізації індивідуального підходу до навчання учнів поетапно з поступовим ускладненням завдань. Визначено умовні етапи підготовки студентів до реалізації індивідуального підходу до навчання учнів: початкове розуміння ролі індивідуального підходу до учнів; засвоєння сутності індивідуалізації та диференціації навчання, розроблення диференційованих завдань; розроблення диференційованих завдань з врахуванням індивідуальних та вікових особливостей учнів; формування професійних компетентностей у майбутніх учителів й закріплення сформованих знань й умінь з реалізації індивідуального підходу до учнів; удосконалення підготовленості студентів до реалізації індивідуального підходу до учнів

Energy-efficient LED irradiator for greenhouse cropping

The paper presents the results of modeling and calculation of highly directional optimal light intensity curve (LIC). The authors proved the effectiveness of using the calculated LIC for lighting of greenhouse plants. A method for placing fixtures with LIC in a typical greenhouse was recommended

Analytical investigation of cargo displacement during the movement of rolling stock on a curved section of a track

The article gives an account of the results of generalized fastening mathematical modeling of cargo asymmetrically allocated both lengthwise and crosswise the wagon during the rolling stock movement on a curve under the exposure to the spatial force system. On the basis of the particular case of spatial modeling it is possible to obtain mathematical and dynamic fastening models under separate exposures to lengthwise and vertical, crosswise and vertical forces

In silico identification of genes involved in selenium metabolism: evidence for a third selenium utilization trait

<p>Abstract</p> <p>Background</p> <p>Selenium (Se) is a trace element that occurs in proteins in the form of selenocysteine (Sec) and in tRNAs in the form of selenouridine (SeU). Selenophosphate synthetase (SelD) is required for both utilization traits. However, previous research also revealed SelDs in two organisms lacking Sec and SeU, suggesting a possible additional use of Se that is dependent on SelD.</p> <p>Results</p> <p>In this study, we conducted comparative genomics and phylogenetic analyses to characterize genes involved in Se utilization. Candidate genes identified included SelA/SelB and YbbB that define Sec and SeU pathways, respectively, and NADH oxidoreductase that is predicted to generate a SelD substrate. In addition, among 227 organisms containing SelD, 10 prokaryotes were identified that lacked SelA/SelB and YbbB. Investigation of <it>selD </it>neighboring genes in these organisms revealed a SirA-like protein and two hypothetical proteins HP1 and HP2 that were strongly linked to a novel Se utilization. With these new signature proteins, 32 bacteria and archaea were found that utilized these proteins, likely as part of the new Se utilization trait. Metabolic labeling of one organism containing an orphan SelD, <it>Enterococcus faecalis</it>, with ⁷⁵Se revealed a protein containing labile Se species that could be released by treatment with reducing agents, suggesting non-Sec utilization of Se in this organism.</p> <p>Conclusion</p> <p>These studies suggest the occurrence of a third Se utilization trait in bacteria and archaea.</p

UGA codon position-dependent incorporation of selenocysteine into mammalian selenoproteins

It is thought that the SelenoCysteine Insertion Sequence (SECIS) element and UGA codon are sufficient for selenocysteine (Sec) insertion. However, we found that UGA supported Sec insertion only at its natural position or in its close proximity in mammalian thioredoxin reductase 1 (TR1). In contrast, Sec could be inserted at any tested position in mammalian TR3. Replacement of the 3′-UTR of TR3 with the corresponding segment of a Euplotes crassus TR restricted Sec insertion into the C-terminal region, whereas the 3′-UTR of TR3 conferred unrestricted Sec insertion into E. crassus TR, in which Sec insertion is normally limited to the C-terminal region. Exchanges of 3′-UTRs between mammalian TR1 and E. crassus TR had no effect, as both proteins restricted Sec insertion. We further found that these effects could be explained by the use of selenoprotein-specific SECIS elements. Examination of Sec insertion into other selenoproteins was consistent with this model. The data indicate that mammals evolved the ability to limit Sec insertion into natural positions within selenoproteins, but do so in a selenoprotein-specific manner, and that this process is controlled by the SECIS element in the 3′-UTR

Evaluation of the effect of led irradiator spectral content on the development of greenhouse plants

The work presents the results of an experiment studying the effect of radiation spectral content (considering its equal intensity in terms of photosynthetically active radiation) on the growth and development of greenhouse model plants. The results demonstrate that the effective development of model subjects requires the adaptation of radiation spectral content according to the growth period and plant type, unlike the illumination level. The obtained results demonstrate the necessity of the creation of adaptive irradiation unit

The influence of light spectrum on morphogenesis of orchid germs in vitro

The aim of the study is to reveal growth and developments specificities of orchid (Cymbidium hybridum F1) germinant in vitro cultured early in the ontogenesis in relation to various light spectra. Chromatic and achromatic luminous tubes (Philips, TLD 18 W) were used as lighting sources. 4 light patterns were tested: control group - colorless (white) light WL; group 1 - WL with addition of red WL+RL, group 2 - WL and blue WL+BL, group 3 - WL and green WL+GL. The authors showed that during C. hybridum F1cultivation in type breeding ground, morphometric growth indexes of root and leaf and wet weight of germs raised with the increase of red light part in PAR (photosynthetically active radiation) flux, thought stem length was twice bigger under the mix of colorless and green light, and also blue light addition to achromatic emission aided the reduction of germ parameters, in contrast with control group. Growth characteristics of plants, cultivated under photoculture conditions, can be adjusted by light with varied spectral content