Two closely related parasitoid wasp species with different host specificities were used for experimental studies on the biology of host finding, a crucial element of parasitoid life history: The habitat and host specialist Nasonia vitripennis and the habitat and host generalist Dibrachys microgastri (Chalcidoidea: Pteromalidae). The host finding parameters tested included reaction to olfactory cues, aspects of locomotor activity, ability to locate hidden hosts and day-night-activity. The results revealed distinct interspecific differences that match the respective host and habitat ranges of the two species. In N. vitripennis host finding is dominated by olfactory reaction to hosts and host habitat, i.e., fly puparia and birds' nests. In D. microgastri olfactory cues have only a minor role. Its host finding is characterized by rapid searching at random. Both species are able to locate hidden hosts. Although still incomplete, these insights into host finding by two parasitoid species with different life history strategies indicate they can be characterized by specific combinations of behavioural host finding features. and Ralph S. Peters.
A refined common generalization of known theorems (Arhangel’skii, Michael, Popov and Rančin) on the Fréchetness of products is proved. A new characterization, in terms of products, of strongly Fréchet topologies is provided.
The aim of our study was to develop a model producing obese mice in early adulthood (4-6 weeks) based on their over-nutrition during fetal and early postnatal development. The fertilized dams of the parental generation were fed the standard diet supplemented with high-energy nutritional product Ensure Plus during gestation and lactation. De livered weanlings were then fed with standard or supplemented diet and assessed for body fat deposits using EchoMRI at the ti me of early and late adulthood. Maternal over-feeding during th e period before weaning had the most significant effect on obesity development in the filial generation. In weanlings, signific antly higher body fat deposits and average body weight were recorded. Later, further significant increase in percentage of body fat in both male and female mice was observed. Withdrawal of the Ensure Plus supplement caused a decrease in the percentage of body fat in part of the filial generation. In offspring fed the standard diet, higher fat deposits persisted till the time of late adulthood. We conclude that this diet-induced obesity model might be used in exploration of the effects of elevated body fat on physiological functions of various organ systems during juvenile and early adulthood periods of life of a human being., J. Kubandová ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy
This paper focuses on a two-layer approach to genetic programming algorithm and the improvement of the training process using ensemble learning. Inspired by the performance leap of deep neural networks, the idea of a multilayered approach to genetic programming is proposed to start with two-layered genetic programming. The goal of the paper was to design and implement a twolayer genetic programming algorithm, test its behaviour in the context of symbolic regression on several basic test cases, to reveal the potential to improve the learning process of genetic programming and increase the accuracy of the resulting models. The algorithm works in two layers. In the first layer, it searches for appropriate sub-models describing each segment of the data. In the second layer, it searches for the final model as a non-linear combination of these sub-models. Two-layer genetic programming coupled with ensemble learning techniques on the experiments performed showed the potential for improving the performance of genetic programming.
In many natural language processing applications two or more models usually have to be involved for accuracy. But it is difficult for minor models, such as “backoff” taggers in part-of-speech tagging, to cooperate smoothly with the major probabilistic model. We introduce a two-stage approach for model selection between hidden Markov models and other minor models. In the first stage, the major model is extended to give a set of candidates for model selection. Parameters weighted hidden Markov model is presented using weighted ratio to create the candidate set. In the second stage, heuristic rules and features are used as evaluation functions to give extra scores to candidates in the set. Such scores are calculated using a diagnostic likelihood ratio test based on sensitivity and specificity criteria. The selection procedure can be fulfilled using swarm optimization technique. Experiment results on public tagging data sets show the applicability of the proposed approach.
The purpose of the paper is to present existing and discuss modified optimization models and solution techniques which are suitable for engineering decision-making problems containing random elements with emphasis on two decision stages. The developed aproach is called two-stage stochastic programming and the paper links motivation, applicability, theoretical remarks, transformations, input data generation techniques, and selected decomposition algorithms for generalized class of engineering problems. The considered techniques have been found applicable by the experience of the authors in various areas of engineering problems. They have been applied to engineering design problems involving constraints based on differential equations to achieve reliable solutions. They have served for technological process control e.g. in melting, casting, and sustainable energy production. They have been used for industrial production technologies involving related logistics, as e.g. fixed interval scheduling under uncertainty. The paper originally introduces several recent improvements in the linked parts and it focuses on the unified two-stage stochastic programming approach to engineering problems in general. It utilizes authentic experience and ideas obtained in certain application areas and advises their fruitful utilization for other cases. The paper follows the paper published in 2000 which deals with the applicability of static stochastic programs to engineering design problems. Therefore, it refers to the basic concepts and notation introduced there and reviews only the principal ideas in the beginning. Then. it focuses on motivation of recourse concepts and two decision stages from engineering point of view. The principal models are introduced and selected theoretical features are reviewed. They are also accompanied by the discussion about difficulties caused by real-world cases. Scenario-based approach is detailed as the important one for the solution of engineering problems, discussion in data input generation is added together with model transformation remarks. Robust algorithms suitable for engineering problems involving nonlinearities and integer variable are selected and scenario-based decomposition is preferred. An original experience with using heuristics is shared. Several postprocessing remarks are added at the end of the paper, which is followed by an extensive literature review. and Obsahuje seznam literatury
Vztahy mezi všeobecnými sestrami a lékaři jsou zejména v posledních letech předmětem zvýšeného zájmu. Existující problémy lze na jedné straně vyjádřit jako specifický odraz strukturálních změn ve společnosti jako celku, na druhé straně jako odraz změn v systému zdravotní péče. Ve zdravotnictví vyspělých zemí dochází ke změně společenského postavení všeobecných sester a lékařů. Všeobecné sestry získávají vyšší vzdělání, další kompetence a zvyšují si své postavení v současném systému zdravotní péče. Bez řádně provedených empirických výzkumů nelze všeobecně hovořit o napětí nebo až konfliktnosti ve vztahu lékař –všeobecná sestra. Na základě reprezentativního výzkumu lékařů a všeobecných sester v České republice bylo cílem zjistit názory (v daném článku lékařů) na problematiku vzájemných vztahů, předávání si kompetencí, společně s řešením konfliktů ve vzájemném vztahu. Na závěr článku (viz příloha) je vytvořena strategie k podpoře týmové spolupráce sester a lékařů., Recently, the relationships between nurses and doctors have become the centre of attention. On one hand, the existing problems can be expressed as a specific reflection of structural changes in the society; on the other hand, they reflect the changes in the health care system. In the developed countries, the social status of general nurses and doctors has been changing. Nurses obtain higher education and competences and improve their position in the current health care system. The expressions “stressful” or even “conflicting” relationships between doctors and nurses should not be used without a reliable previous empiric research. On the basis of a representative research performed on doctors (in the particular article, performed by doctors), the opinions on the problems of mutual relationships, delegation of the competences and dealing with conflicts of the mutual relationships was searched. In the conclusion of the article, a strategy to support the team cooperation of doctors and nurses was developed (see Appendix)., Sylva Bártlová, and Lit.: 9
Koncept chování typu C definovala Lydia Temoshoková v roce 1981. Chování typu C je charakterizováno potlačováním a neprojevováním negativních emocí, zvláště pak hněvu, zachováváním zdání klidu a příjemnosti a orientací na potřeby druhých více než potřeby osoby samotné. Celosvětově však dochází k zaměňování pojmů „chování typu C“ za neadekvátně užívaný pojem „osobnost typu C“ či „cancer-prone personality“. Toto stanovisko si dovolujeme tak jasně postulovat na základě konzultace s autorkou pojmu, Lydií Temoshokovou. Misinterpretace pojmu chování typu C vedla také k přesvědčení, že tento typ chování může jedince predisponovat ke vzniku nádorového onemocnění. Avšak koncept chování typu C popisuje copingovou strategii, která má, dle dosavadních výzkumů, vliv na rychlejší progresi nádorového onemocnění a onemocnění HIV následkem ovlivňování funkce imunitního systému. Diskutujeme obtíže s výzkumem chování typu C a představujeme metodu Vignette Similarity Rating Method (VSRM) vyvinutou Lydií Temoshokovou jako možný nástroj k výzkumnému zachycení chování typu C., The Type C concept was first described by Dr. Lydia Temoshok in 1981. The Type C is characterized by suppression and non-expression of negative emotions, especially by suppressing anger, maintaining a facade of contentment and being more concerned about the needs of other people than about one’s own needs. The term „Type C“ has been worldwide confused with inadequate terms „Type C personality“ or „cancer-prone personality“. We only allow ourselves to postulate this statement so strongly after having consulted the issue directly with Dr. Lydia Temoshok, the author of the term. The misinterpretation of the type C behaviour pattern led to a belief that this type of behaviour can predispose development of cancer in a person. However, according to existing research, the Type C concept describes a coping strategy that causes a faster progression of cancer and HIV due to changes in the immune system. We discuss obstacles with the Type C research and we introduce the Vignette Similarity Rating Method (VSRM), a method developed by Dr. Lydia Temoshok, enabling detection of the Type C behaviour pattern in a research., Peterková, H., Skřivanová, K., Brančíková, D., Bendová, M., Anderková, Ľ., and Literatura
The microanatomy of several oribatid and one acaridid mite was studied to determine the role of free cells (haemocytes) in mites. Mites from the field as well as laboratory cultures were observed and analyzed histologically using Masson triple stain. The mites were offered various foods and kept in fluctuating moisture conditions. The presence of haemocytes was significantly correlated with the transport between internal organs of various substance. Three types of transport were recorded: (i) enzymes into the alimentary tract, including the incorporation of haemocytes into the gut walls. This process seemed to be correlated with the amount and type of food and frequently with the presence of internal extraintestinal bacteria associated with mesenchyma; (ii) metabolites, like guanine from mesenchyma into the alimentary tract followed by expulsion from the body via the gut. This process is correlated with food of high nitrogen content or dry conditions; (iii) resorption of nutrients from eggs during an induced quiescent state under unfavourable conditions by small haemocytes.