80 research outputs found
The base of institutions in county centres
A number and variety of existing institutions condition functional diversification of a town. Determination of institutional basis of investigated central places as nine institutions representative for county centres has enabled to distinguish and classify 374 towns in Poland. Varied numbers of coexisting institutions in particular towns have been applied to classify county centres and to determine their importance in the system of central places. In the 20th century, representative institutions, despite theirs various origins and historical development, proved a tendency to concentrate and coexist
in the same or almost the same towns (county centres) all over the country
Les neurones à calrétinine du striatum : comparaisons inter-espÚces et études anatomopathologiques
Chez les primates, les interneurones GABAergiques qui expriment la calrĂ©tinine (CR) sont les interneurones les plus abondants du striatum. Pourtant, Ă ce jour, leur rĂŽle reste encore mal connu. Lâutilisation de techniques dâimmunohistochimie en association avec des modĂšles animaux de la maladie de Parkinson, nous a permis de mieux caractĂ©riser ces interneurones. Une premiĂšre sĂ©rie de travaux dĂ©crit pour la toute premiĂšre fois la distribution et la composition neurochimique des interneurones CR+ chez la souris en condition normale. Ces donnĂ©es ont Ă©tĂ© directement comparĂ©es aux caractĂ©ristiques des interneurones CR+ chez les primates humains et non humains. Chez la souris, deux types morphologiques dâinterneurones CR+ sont prĂ©sents : lâun petit et lâautre de taille intermĂ©diaire ; ils se rĂ©partissent de maniĂšre hĂ©tĂ©rogĂšne dans le striatum dorsal. Chez le singe et lâhumain, trois types morphologiques dâinterneurones CR+ existent. En effet, en plus dâinterneurones CR+ de petite taille et de taille intermĂ©diaire, il existe des interneurones CR+ de grande taille qui appartiennent en majoritĂ© Ă la catĂ©gorie des interneurones cholinergiques du striatum. Lâutilisation dâun modĂšle de souris transgĂ©nique Drd1a-tdTomato/Drd2-EGFP (D1/D2) a permis de confirmer que les interneurones cholinergiques exprimaient le rĂ©cepteur Ă la dopamine (DA) D2 et de dĂ©montrer que les interneurones CR+ chez la souris sont dĂ©pourvus des rĂ©cepteurs D1 et D2. Dans une seconde sĂ©rie de travaux, nous avons cherchĂ© Ă savoir comment la distribution et la composition neurochimique des interneurones CR+ Ă©taient affectĂ©es dans le modĂšle murin de la maladie de Parkinson. Du cĂŽtĂ© de la lĂ©sion 6- hydroxydopamine (6-OHDA), les souris prĂ©sentent une forte dĂ©nervation DAergique du striatum, lâune des principales caractĂ©ristiques de la maladie de Parkinson. Dans ces circonstances, seule la densitĂ© des interneurones CR+ de taille intermĂ©diaire, dont 13 % apparaissent immunorĂ©actifs pour la tyrosine hydroxylase (TH), est significativement diminuĂ©e dans le striatum dorsal. Bien que le noyau accumbens (Acb) subisse Ă©galement une forte baisse de son innervation DAergique induite par la lĂ©sion 6-OHDA, les interneurones CR+ prĂ©sents dans lâAcb, dont certains sont aussi immunorĂ©actifs pour la calbindine (CB), ne sont pas affectĂ©s en terme de nombre et de distribution. La troisiĂšme sĂ©rie de travaux nous a permis de reproduire ces analyses chez le primate grĂące Ă lâutilisation du modĂšle animal de la maladie de Parkinson par intoxication au 1-mĂ©thyl-4-phĂ©nyl-1,2,3,6-tĂ©trahydropyridine (MPTP). Les rĂ©sultats indiquent que la densitĂ© des interneurones CR+ de grande taille est fortement accrue dans le striatum des animaux intoxiquĂ©s par le MPTP. Cette forte augmentation de la densitĂ© des interneurones CR+ de grande taille est couplĂ©e Ă une augmentation significative de la proportion dâinterneurones ChAT+/CR+. Lâensemble de ces donnĂ©es suggĂšre fortement que les interneurones striataux CR+ soient sensibles Ă une diminution de la concentration en DA dans le striatum dorsal, qui caractĂ©rise la maladie de Parkinson. Finalement, une quatriĂšme sĂ©rie de travaux nous a permis de dĂ©couvrir un regroupement de cellules de petite taille et au phĂ©notype D1 au sein mĂȘme de lâAcb chez la souris D1/D2, suggĂ©rant lâexistence dâun nouvel Ăźlot de Calleja dans cette rĂ©gion du cerveau.In the primate striatum, GABAergic neurons that express calretinin (CR) are the most abundant interneurons. Their role within this major basal ganglia component is still unknown. Immunohistochemical techniques used in animal models of Parkinsonâs disease allowed us to better characterize these interneurons. A first series of studies enabled us to provide the very first description of the distribution and neurochemical phenotype of the CR+ interneurons in mice striatum, under normal condition. Data was compared to similar findings that were gathered in human and non-human primates. In mice, two morphological phenotypes of CR+ interneurons are present: (1) small and (2) medium-sized CR+ interneurons, both distributed in a heterogeneous way within the dorsal striatum. In primates (both human and non-human), three morphological phenotypes of CR+ interneurons are present within the striatum. In addition to small and medium-sized CR+ interneurons, primates display large-sized CR+ interneurons, which mostly belong to the cholinergic interneurons of the striatum. The use of a double transgenic mouse model Drd1a-tdTomato/Drd2-EGFP (D1/D2) confirmed that the cholinergic interneurons express the dopaminergic (DA) receptor D2, while CR+ interneurons are devoid of D1 and D2. In a second study, we investigated how the distribution and the neurochemical phenotype of the CR+ interneurons are affected in the 6-hydroxydopamine (6-OHDA) mouse model of Parkinsonâs disease. In the lesioned striatum, these mice displayed a strong DAergic depletion, one of the main hallmarks of Parkinsonâs disease. Under these circumstances, only the density of the medium-sized CR+ interneurons, 13 % of which are immunoreactive for the tyrosine hydroxylase (TH), was decreased within the dorsal striatum. In the accumbens nucleus (Acb), the number and distribution pattern of CR+ interneurons, which are also immunoreactive for calbindin (CB), were not affected, despite that the Acb was also significantly depleted in DA. In a third study, the state of the CR+ striatal interneurons was investigated in a simian model of Parkinsonâs disease, involving 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) intoxication. Results indicate that the density of the large-sized CR+ interneurons is dramatically increased within the striatum of MPTP-intoxicated animals. This increase goes along with higher proportion of cholinergic interneurons expressing CR. Altogether, our data suggest that the CR+ interneurons are sensitive to a decrease of the DAergic level in the striatum that characterizes Parkinsonâs disease. Finally, a detailed analysis of the Acb in the D1/D2 mice allowed us to detect the presence of a novel island of Calleja located within this brain region
GĆĂłwne centra Metropolii "Silesia"
The main purpose of the article is the need to determine precisely the centres of the currently forming Upper Silesia metropolis, quite frequently called Metropolis âSilesiaâ. Due to the typical conurbation arrangement of the cities a hypothesis has been formulated that in the contemporary forming metropolis main centres exist. It can be expected that within the Upper Silesian conurbation not only Katowice will build the metropolis, but also other cities of a well developed high-order (metropolitan) functions. Location of colleges, research and development institutions, showrooms selling expensive cars and luxurious hotels are the right institutions. Due to a complex analysis of four selected factors determining development of the metropolis, a few potential metropolitan centres have been chosen out of several dozens of cities. First of all the centre of Metropolis âSilesiaâ is very distinctly formed in Katowice. As the second centre, although with lesser significance and in some part complementary to Katowice, Gliwice at the western end of the metropolis could be appointed. On the other hand Sosnowiec, Zabrze, ChorzĂłw and Tychy appear as auxiliary and constantly developing centres of the vast Metropolis âSilesiaâ
PGI41 Health-Related Quality of Life In Patients With Inflammatory Bowel Disease In Poland (Application of The Eq-5d And Self-Assessment of Health State)
Etapy rozwoju gospodarczego i przestrzennego Ustronia
The paper concerns functional changes on the example of UstroĆ. For a long time several independent
rural settlements existed there. In 18th century the process of industrialization was initiated
in village UstroĆ. In the same time healthâresort
began to develop. It based on good natural environment
conditions as well as industrial and rural products. Both functions coâ
existed till the end of 20th
century, indicating changes of domination in different periods. Nowadays tourist function obtains
the greatest predominance. Industry undergoes changes, progressive liquidation and it concentrates
in north parts of UstroĆ
PodobieĆstwa i rĂłĆŒnice przestrzeni publicznej Molsheim i NiepoĆomic
PrzestrzeĆ publiczna stanowi niezwykle interesujÄ
cy przedmiot badaĆ, co wyraĆșnie moĆŒna zaobserwowaÄ na terenie mniejszych oĆrodkĂłw miejskich. Autorzy porĂłwnali stan zagospodarowania przestrzeni publicznej dwĂłch maĆych miast, Molsheim we wschodniej Francji i NiepoĆomic na poĆudniu Polski. Obydwa miasta znajdujÄ
siÄ w bezpoĆredniej strefie oddziaĆywania dwĂłch duĆŒych metropolii: Strasburga i Krakowa. Obydwa wykazujÄ
, pomimo duĆŒej dzielÄ
cej ich odlegĆoĆci, podobieĆstwa wynikajÄ
ce m.in. z rozwoju we wspĂłlnym krÄgu cywilizacyjnym.UdostÄpnienie publikacji Wydawnictwa Uniwersytetu ĆĂłdzkiego finansowane w ramach projektu âDoskonaĆoĆÄ naukowa kluczem do doskonaĆoĆci ksztaĆceniaâ. Projekt realizowany jest ze ĆrodkĂłw Europejskiego Funduszu SpoĆecznego w ramach Programu Operacyjnego Wiedza Edukacja RozwĂłj; nr umowy: POWER.03.05.00-00-Z092/17-00.
Wydano z pomoc finansĂłw Komitetu Nauk Geograficznych PAN i UrzÄdu Miasta Ćodzi
Striatal neurons expressing D1 and D2 receptors are morphologically distinct and differently affected by dopamine denervation in mice
The loss of nigrostriatal dopamine neurons in Parkinsonâs disease induces a reduction in the number of dendritic spines on medium spiny neurons (MSNs) of the striatum expressing D1 or D2 dopamine receptor. Consequences on MSNs expressing both receptors (D1/D2 MSNs) are currently unknown. We looked for changes induced by dopamine denervation in the density, regional distribution and morphological features of D1/D2 MSNs, by comparing 6-OHDA-lesioned double BAC transgenic mice (Drd1a-tdTomato/Drd2-EGFP) to sham-lesioned animals. D1/D2 MSNs are uniformly distributed throughout the dorsal striatum (1.9% of MSNs). In contrast, they are heterogeneously distributed and more numerous in the ventral striatum (14.6% in the shell and 7.3% in the core). Compared to D1 and D2 MSNs, D1/D2 MSNs are endowed with a smaller cell body and a less profusely arborized dendritic tree with less dendritic spines. The dendritic spine density of D1/D2 MSNs, but also of D1 and D2 MSNs, is significantly reduced in 6-OHDA-lesioned mice. In contrast to D1 and D2 MSNs, the extent of dendritic arborization of D1/D2 MSNs appears unaltered in 6-OHDA-lesioned mice. Our data indicate that D1/D2 MSNs in the mouse striatum form a distinct neuronal population that is affected differently by dopamine deafferentation that characterizes Parkinsonâs disease
Aberrant Lipid Metabolism in the Forebrain Niche Suppresses Adult Neural Stem Cell Proliferation in an Animal Model of Alzheimerâs Disease
SummaryLipid metabolism is fundamental for brain development and function, but its roles in normal and pathological neural stem cell (NSC) regulation remain largely unexplored. Here, we uncover a fatty acid-mediated mechanism suppressing endogenous NSC activity in Alzheimerâs disease (AD). We found that postmortem AD brains and triple-transgenic Alzheimerâs disease (3xTg-AD) mice accumulate neutral lipids within ependymal cells, the main support cell of the forebrain NSC niche. Mass spectrometry and microarray analyses identified these lipids as oleic acid-enriched triglycerides that originate from niche-derived rather than peripheral lipid metabolism defects. In wild-type mice, locally increasing oleic acid was sufficient to recapitulate the AD-associated ependymal triglyceride phenotype and inhibit NSC proliferation. Moreover, inhibiting the rate-limiting enzyme of oleic acid synthesis rescued proliferative defects in both adult neurogenic niches of 3xTg-AD mice. These studies support a pathogenic mechanism whereby AD-induced perturbation of niche fatty acid metabolism suppresses the homeostatic and regenerative functions of NSCs
Effectiveness of screening for atrial fibrillation and its determinants. A meta-analysis
<div><p>Background</p><p>Many atrial fibrillation patients eligible for oral anticoagulants are unaware of the presence of AF, and improved detection is necessary to facilitate thromboprophylaxis against stroke.</p><p>Objective</p><p>To assess the effectiveness of screening for AF compared to no screening and to compare efficacy outcomes of different screening strategies.</p><p>Materials and methods</p><p>Cochrane Central Register of Controlled Trials, EMBASE and MEDLINE from Jan 1, 2000 âDec 31, 2015 were searched. Studies employing systematic or opportunistic screening and using ECG or pulse palpation in populations age â„40 years were included. Data describing study and patient characteristics and number of patients with new AF were extracted. The outcome was the incidence of previously undiagnosed AF.</p><p>Results</p><p>We identified 25 unique (3 RCTs and 22 observational) studies (n = 88 786) from 14 countries. The incidence of newly detected AF due to screening was 1.5% (95% CI 1.1 to 1.8%). Systematic screening was more effective than opportunistic: 1.8% (95% CI 1.4 to 2.3%) vs. 1.1% (95% CI 0.6 to 1.6%), p<0.05, GP-led screening than community based: 1.9% (95% CI 1.4 to 2.4%) vs. 1.1% (95% CI 0.7 to 1.6%), p<0.05, and repeated heart rhythm measurements than isolated assessments of rhythm: 2.1% (95% CI 1.5â2.8) vs. 1.2% (95% CI 0.8â1.6), p<0.05. Only heart rhythm measurement frequency had statistical significance in a multivariate meta-regression model (p<0.05).</p><p>Conclusions</p><p>Active screening for AF, whether systematic or opportunistic, is effective beginning from 40 years of age. The organisation of screening process may be more important than technical solutions used for heart rhythm assessment.</p></div
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POPULATION DYNAMICS OF NOCTURNAL DESERT RODENTS: A NINE YEAR STUDY.
Demography of nocturnal desert rodents was monitored for nine years. Three dissimilar areas were sampled with three distinct trapping configurations and time regimes. All three areas contained similar rodent species. Increased plant growth and seed production resulting from variations in rainfall seemed to have the most profound effect on both rodent densities and species composition. Deviations from the bimodal rainfall pattern occurred in the latter parts of 1972, 1977, and 1978 and early 1973, 1978, and 1979. During these times there was a 2-4 fold increase in rainfall. This pattern produced "desert blooms" in the spring of 1973, 1978, and to some extent 1979. In addition, 1972 and 1978 were years of high rainfall. The reaction of the rodents to the increased plant production was rapid and dramatic. Heteromyid numbers increased approximately six fold with some species increasing twelve fold within a matter of five months. The smaller heteromyids, Perognathus amplus and P. penicillatus, were the first to increase substantially, while the larger rodents reached peak populations in the following year. The resulting population crash that followed the high densities was as dramatic as the increase. Neotoma albigula populations did not increase substantially after the first rainfall phenomenon but did so dramatically after the second period of aberrant rains. The densities of N. albigula remained high long after the heteromyid populations decreased to "normal" levels. The three areas were found to be dominated by different species while the overall rodent densities in the three areas were very similar within the same time frame
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