A COMPARISON OF TWO DNA SEQUENCING METHODS

In the paper the problem of DNA sequencing is considered. The sequencing methodby Pevzner [8] is analyzed and its generalization, allowing for finding all acceptablesolutions, is described. It is then compared with another method based on a generation of asolution tree [4],keywords: DNA sequencing, hybridization method, complexity analysis.Pozna

SUBOPTIMAL APPROACHES TO SCHEDULING MALLEABLE TASKS

In the paper, the problem of scheduling a set of n malleable tasks on m parallel computers is considered. The tasks may be executed by several processors simultaneously and the processing speed of a task is a function of the number of processors alloted. The problem is motivated by real-life applications of parallel computer systems in scientific computing of highly parallelizable tasks. Starting from the continuous version of the problem (i. e. where the tasks may require a fractional part of the resources), we propose a general approximation algorithm with a performance guarantee equal to 2. Then, some improvements are derived that lead to a very good average behavior of the scheduling algorithm.Pozna

The Development of Key Positions in Crises on the Example of the COVID-19 Pandemic

Theoretical background: Talent management refers to how organizations attract, select, develop and manage talented employees. Thus, talent development is an important part of the overall process. It can be observed that there are relatively few papers focusing primarily on talent development. Meanwhile, it is a more complex and fraught activity than many HR specialist recognize, thus, it is worth paying more attention and research. Even less papers covers talent development during COVID-19 as it is a relatively new problem and research is still ongoing.Purpose of the article: The aim of the article is to present the results of research on the conduct of development processes by companies for talented employees during the COVID-19 pandemic.Research methods: For the analysis, literature studies were carried out and the quantitative study with the use of the author’s questionnaire and CATI interview was organized in October–November 2020. The research sample included 102 purposefully selected organizations.Main findings: Research indicates that organizations have been affected by the pandemic in terms of their personnel policies. They decided to take restrictions, but their degree was different for talents and other employees. The biggest restrictions affected training budgets, foreign trips and postgraduate/MBA studies. Organizations continued to run talent development programs in the pandemic, but their scope decreased. Changes in priorities were also noted – the importance of talent development before the pandemic was greater for respondents. During the pandemic, retaining talent and building their commitment came to the fore. The analysis also made comparisons with the results of author’s own studies on subprime crisis, which show that the organization’s actions in these two crisis situations have converged in many areas. In particular, it was decided to maintain developmental activities, but in exchange for more costly forms of development, talents were offered cheaper internal training, projects or job rotation. The differences include the inclusion of talent in strategic projects, “crisis headquarters”, which was observed to a large extent during the subprime crisis, but did not appear in the pandemic results. It should be emphasised that the research was carried out in two different groups, which does not authorise clear conclusions, but only allows for very preliminary reflections on the behaviour of the organization in these two situations. Research results contribute to reducing the research gap in the talent development process during pandemic or crisis. Theoretical background: Talent management refers to how organizations attract, select, develop and manage talented employees. Thus, talent development is an important part of the overall process. It can be observed that there are relatively few papers focusing primarily on talent development. Meanwhile, it is a more complex and fraught activity than many HR specialist recognize, thus, it is worth paying more attention and research. Even less papers covers talent development during COVID-19 as it is a relatively new problem and research is still ongoing.Purpose of the article: The aim of the article is to present the results of research on the conduct of development processes by companies for talented employees during the COVID-19 pandemic.Research methods: For the analysis, literature studies were carried out and the quantitative study with the use of the author’s questionnaire and CATI interview was organized in October–November 2020. The research sample included 102 purposefully selected organizations.Main findings: Research indicates that organizations have been affected by the pandemic in terms of their personnel policies. They decided to take restrictions, but their degree was different for talents and other employees. The biggest restrictions affected training budgets, foreign trips and postgraduate/MBA studies. Organizations continued to run talent development programs in the pandemic, but their scope decreased. Changes in priorities were also noted – the importance of talent development before the pandemic was greater for respondents. During the pandemic, retaining talent and building their commitment came to the fore. The analysis also made comparisons with the results of author’s own studies on subprime crisis, which show that the organization’s actions in these two crisis situations have converged in many areas. In particular, it was decided to maintain developmental activities, but in exchange for more costly forms of development, talents were offered cheaper internal training, projects or job rotation. The differences include the inclusion of talent in strategic projects, “crisis headquarters”, which was observed to a large extent during the subprime crisis, but did not appear in the pandemic results. It should be emphasised that the research was carried out in two different groups, which does not authorise clear conclusions, but only allows for very preliminary reflections on the behaviour of the organization in these two situations. Research results contribute to reducing the research gap in the talent development process during pandemic or crisis

PARAMETER ANALYSIS OF CLUSTERS OF MELTING TEMPERATURES OF DNA CHAINS

In the paper the problem of DNA sequencing by hybridization (SBH) is considered.With the developed software, MELTEM, several assembling procedures are used to ease acollecting a subset of oligonucleotides that would melt under practically identical conditionsin a hybridization experiment. Some clustering approaches implemented in the program arecompared. The algorithms of MELTEM are presented as well as the selected examples of amelting temperature analysis.Pozna

Sequential algorithms for DNA sequencing

Reconstruction of the original DNA sequence in sequencing by hybridizationapproach (SBH) due to a large number of possible combinations requires acomputational support. In the paper, a new method of sequencing has beenproposed. Two algorithms based on its idea have been implemented and tested: forthe case of an ideal hybridization experiment (complete data) and for more generalcase, when some data are missing, like in the real experiment. Authentic DNAsequences have been used for testing. A parallel version of the second algorithm hasbeen also implemented and tested. The quality of the reconstruction is satisfactoryfor the library of oligunucleotides of length 9, and 100, 200 and 300-bp longsequences. A way to a further decrease of the computation time is also suggested,keywords: DNA sequencing,Pozna

Mislabeling and nomenclatorial confusion of Typhlotanais sandersi Kudinova-Pasternak, 1985 (Crustacea: Tanaidacea) and establishment of a new genus

Re-examination of historical collections allowed us to resolve the taxonomic status of Typhlotanais sandersi Kudinova-Pasternak, 1985, originally described based on a single specimen from Great-Meteor Seamount. The holotype of this species was considered lost and the species redescribed based on a second specimen from the type locality by Błażewicz-Paszkowycz (2007a), who placed Ty. sandersi on a newly established genus Typhlamia. Thorough morphological analysis of Typhlamia and Typhlotanais species and recently obtained genetic data of typhlotanaids from N Atlantic and NW Pacific waters allow us to conclude that the redescription of Ty. sandersi by Błażewicz-Paszkowycz (2007a) was based on a wrongly labelled specimen that, rather than a type of Ty. sandersi, represents in fact a new species of Typhlamia. The morphological comparison of the type species of Typhlotanais (Ty. aequiremis) with all 'long-bodied' typhlotanaid taxa with rounded pereonites margins (i.e., Typhlamia, Pulcherella, Torquella), and the use of genetic evidence, support the establishment of a new genus to accommodate: Ty. sandersi, Ty. angusticheles Kudinova-Pasternak, 1989, and a third species from N Atlantic waters, that is described here for the first time. Current knowledge on 'long-bodied' typhlotanaids with rounded pereonites is summarised and a taxonomical key for their identification provided

An "in Vitro" study of polymer-based composites

Structures of most tissues in the human body can be simulated with fibrous composite materials. A major problem associated with designing biocompatible composites for reconstruction of damaged or missing tissues is the ability to mimic such structures. The physical, chemical and mechanical properties of composite materials should be similar to those of the native tissue. Another very important factor of polymer-based fibrous composite materials, which can relatively easily be modified, is their surface microstructure. This surface microstructure depends on the way of preparation, type of polymer matrix and kind of reinforcement. This work was aimed to determine the biological properties of composites obtained from carbon fibres and a polymer matrix, which can be used as biomaterial in the reconstruction of cartilage tissue. Two types of samples made from short carbon fibres and two kinds of polymers were tested. The samples were prepared by casting technique. MTT tests were carried out in the presence of hFOB-1.19-line human osteoblasts and HS-5-line human fibroblasts. The results show differences in viability of living cells. Results of the work show significant differences in biocompatibility of pure polymers and composites with short carbon fibres