During the last two decades, genotyping of African rodents has revealed important hidden diversity within morphologically cryptic genera, such as Rhabdomys. Although the distribution of Rhabdomys is known historically, its diversity has been revealed only recently, and information about the distribution range of its constituent taxa is limited. The present study contributes to clarifying the distribution of Rhabdomys taxa, primarily in southern Africa, and identifies gaps in our knowledge, by: 1) compiling the available information on its distribution; and 2) significantly increasing the number of geo-localised and genotyped specimens (n = 2428) as well as the localities (additional 48 localities) sampled. We present updated distribution maps, including the occurrence and composition of several contact zones. A long-term monitoring of three contact zones revealed their instability, and raises questions as to the role of demography, climate, and interspecific competition on species range limits. Finally, an analysis of external morphological traits suggests that tail length may be a reliable taxonomic trait to distinguish between mesic and arid taxa of Rhabdomys. Tail length variation in Rhabdomys and other rodents has been considered to be an adaptation to climatic (thermoregulation) and/or to habitat (climbing abilities) constraints, which has still to be confirmed in Rhabdomys.
The hormone leptin, which is thought to be primarily produced by adipose tissue, is a polypeptide that was initially characterized by its ability to regulate food intake and energy metabolism. Leptin appears to signal the status of body energy stores to the brain, resulting in the regulation of food intake and whole-body energy expenditure. Subsequently, it was recognized as a cytokine with a wide range of peripheral actions and is involved in the regulation of a number of physiological systems including reproduction. In the fed state, leptin circulates in the plasma in proportion to body adiposity in all species studied to date. However other factors such as sex, age, body mass index (BMI), sex steroids and pregnancy may also affect leptin levels in plasma. In pregnant mice and humans, the placenta is also a major site of leptin expression. Leptin circulates in biological fluids both as free protein and in a form that is bound to the soluble isoform of its receptor or other binding proteins such as one of the immunoglobulin superfamily members Siglec-6 (OBBP1). Although the actions of leptin in the control of reproductive function are thought to be exerted mainly via the hypothalamicpituitary-gonadal axis, there have also been reports of local direct effects of leptin at the peripheral level, however, these data appear contradictory. Therefore, there is a need to summarize the current status of research outcomes and analyze the possible reasons for differing results and thus provide researchers with new insight in designing experiments to investigate leptin effect on reproduction. Most importantly, our recent experimental data suggesting that reproductive performance is improved by decreasing concentrations of peripheral leptin was unexpected and cannot be explained by hypotheses drawn from the experiments of excessive exogenous leptin administration to normal animals or ob/ob mice., M. Herrid, S. K. A. Palanisamy, U. A. Ciller, R. Fan, P. Moens, N. A. Smart, J. R. McFarlane., and Obsahuje bibliografii
Let $G=(V, E)$ be a simple graph. A subset $S\subseteq V$ is a dominating set of $G$, if for any vertex $u\in V-S$, there exists a vertex $v\in S$ such that $uv\in E$. The domination number, denoted by $\gamma (G)$, is the minimum cardinality of a dominating set. In this paper we will prove that if $G$ is a 5-regular graph, then $\gamma (G)\le {5\over 14}n$.
The basis number of a graph $G$ is defined by Schmeichel to be the least integer $h$ such that $G$ has an $h$-fold basis for its cycle space. MacLane showed that a graph is planar if and only if its basis number is $\le 2$. Schmeichel proved that the basis number of the complete graph $K_n$ is at most $3$. We generalize the result of Schmeichel by showing that the basis number of the $d$-th power of $K_n$ is at most $2d+1$.
The paper concerns mining data lacking the uniform structure. The
data are collected from a riumber of objects during repeated measurenients, all of which are tagged by a corresponding time. No attribute-valued machine learning algorithm can be applied directly on such data since the number of measurements is not fixed but it varies. The available data háve to be transformed and preprocessed in such a way that a uniform type of Information is obtained about all the considered objects. This can be achieved, e.g., by aggregation. But this process can introduce anachronistic variables, i.e., variables containing Information which cannot be available at the moment when a prediction is needed. The paper suggests and tests a method how to preprocess the considered type of data without falling into a trap of introducing anachronistic attributes. The method is illustrated on a čase study baaed on STULONG data.
V těhotenství je anafylaktická reakce naštěstí sice relativně vzácná, její důsledky ale mohou vést až k závažnému postižení matky i plodu. Ve většině publikovaných případů těžké anafylaxe v těhotenství bylo těžké postižení dokonce spíše na straně plodu než matky. Vznik anafylaxe se většinou nedá předvídat, první symptomy jsou někdy netypické, pouze lokální, ale rychle mohou přecházet v generalizované postižení celého organismu. Ať už jsou zprostředkovány protilátkami typu IgE (pravá anafylaxe), nebo vznikají na jiném podkladě (anafylaktoidní reakce), klinický obraz bývá obdobný. Je třeba myslet na to, že i klinicky nenápadné počáteční symptomy mohou mít průběh závažný a život ohrožující. Každé opomenutí a prodleva v diagnostice a léčbě anafylaxe může vést k fatálnímu konci. O úspěšném výsledku léčby rozhoduje velkou měrou medicínská zkušenost a včasnost zásahu. Protože je toto téma v současné literatuře zmiňováno spíše jen výjimečně, je cílem tohoto článku shrnout problematiku anafylaxe v těhotenství z hlediska patofyziologie, klinického průběhu, diagnostiky i léčby., Anaphylaxis in pregnancy is a relatively rare reaction but it can lead to serious maternal and fetal impairment. In published cases of severe anaphylaxis in pregnancy there were even more severe disabilities in the fetus than the mother. Development of anaphylaxis is usually unpredictable, the first symptoms are sometimes atypical and only local, but can move quickly in a generalized impairment of the whole organism. Whatever they are mediated by IgE antibodies (right anaphylaxis), or are caused on another basis (anaphylactoid reactions), the clinical picture is similar. It should be kept in mind that even clinically inconspicuous initial symptoms may progress into serious and life-threatening state. Any omission and delay in diagnosis and treatment of anaphylaxis can lead to fatal end. A successful outcome is largely dependent on experience and timeliness of medical intervention. Because this topic is mentioned in contemporary literature rather rarely, this review therefore summarizes the issue of anaphylaxis in pregnancy in terms of pathophysiology, clinical course, diagnosis and treatment., Jan Bláha, Pavlína Nosková, Kateřina Bláhová, Ivana Kolníková, and Literatura 56
Vibration of engineering structures results in time variable displacements functions. For realistic structures modes of vibration are determined by exciting frequency and the natural frequencies of the structure. Hence, the components of stress tensor are time function too. In the presented paper the general idea of method of cycle-counting based on the FFT analysis for engineering structures is discussed and analytically verified for the case vibrating beam excited by series pulse-type force with no damping. and V názvu článku je jazyková chyba/překlep - analitical - správně = analytical
This paper describes experimental work done on a prototype of in-pipe bristled minimachine, which locomotes in pipe with inner diameter under 40 mm. The principle of minimachine locomotion is based on difference friction force between bristle tip and pipe wall. The new bristle design and its mathematical and graphical model will be presented. and Obsahuje seznam literatury
The article introduces some activities on Child Neurology Clinic in
evaluation and utilisation of analyses of EEG recordings concerning diagnostic support and research works in epileptology, autism and other indications. This activity is also a base of our contribution in the project ME701 “Neuroinformatics Bases Creation and Knowledge Data Mining”. A short description of the main approaches, utilised sources, used methods and technical means is presented.
Východiska: Metody léčby klasické trigeminální neuralgie (cTN) isou rozličné stejně jako jejich patofyziologie. Pacienti s cTN, u kterých nebyla medikamentózni léčba účinná nebo vyvolala nežádoucí Účinky, jsou kandidáty chirurgické léčby. 07; Prezentace výsledků léčby 1775 pacientů s cTN léčených perkutánní radiofrekvenční rizotomií (pRFR). Je rovněž diskutován současný stav chirurgické léčby cTN. Metodika: V období od 1983 do 2001 bylo v Neurochirurgickém ústavu v Bělehradě metodou pRFR léčeno 1775 pacientů s onemocněním cTN. Autoři analyzovali inidální a dlouhodobě výsledky, tr jako např. vliv rozličných typů cTN, dosažení faciální hypestezie po pRFR a předchozích chirurgických procedur v trigeminové oblasti na výsledky léčení. Výsledky: Dobrých iniciálních výsledků bylo docíleno u 96 % pacientů; recidivita po 5 letech se objevila u 21 % pacientů. Výsledky byly úspěšnější U pacientů, kteří prodělali krátkodobou, epizodickou, ostrou bolest v porovnání s těmi, jejichž bolesti zahrnovaly i složku stálé, tupé bolesti. Úvodní stupeň a doba trvání faciální hypestezie vyvolané pRFR nejen zvýšila úspěšnost ve zmírnění bolesti, ale také tíži neurologických komplikací. Závěr: pRFR nebo operace gamma nožem jsou doporučovány jako metody první volby v rámci chirurgické léčby pacientů s cTN. Mikrovaskulámí dekomprese by měla být zvážena u mladších pacientů s jednoznačnou neuroradiologickou diagnózou neurovaskulámí komprese v oblasti trigeminal root entry zone, nebo po selhání peí perkutánních neurochirurgických procedur., Background: Treatment of classic trigeminal neuralgia (cTN) has been as diverse as explanations of its pathophysiology. The patients with cTN refractory to medical treatment are candidates for surgical procedures. Aims: We report our results on 1775 patients treated for cTN with percutaneous radiofrequency rhizotomy (pRFR). We also discuss the current state of surgical management of cTN. Methods: In the period from 1983 to 2001, 1775 patients underwent pRFR for relief of cTN at the Institute of Neurosurgery in Belgrade. The authors analyzed the initial results and long-term follow- up data, such as the influence of different types of cTN, achieved facial hypesthesia after pRFR and prior trigeminal surgical procedures on the treatment outcome. Results: Initial positive results were obtained in 96% of the patients, while the recurrence rate after five years accounted for 21%, taking into consideration the whole series. Better results were achieved in patients with short episodic, sharp pain than in patients suffering from pain containing a more constant, throbbing component. Unfortunately, the initial degree and duration of facial hypesthesia provoked by pRFR, not only increased the success in pain relief, but also the degree of neurological complications. Conclusion: We recommend pRFR or gamma knife surgery (GK) as the first procedure for surgical treatment in majority of patients suffering from cTN. Microvascular decompression (MVD) should be considered for younger patients with clear radiological diagnosis of neurovascular compression at the trigeminal root entry zone or after failed percutaneous neurolytic procedures., Eugen Slavík, D. Radulović, and Lit. 36