40 research outputs found

    Dolomitnövényzet stabilitåsa és regenerålódåsa = Stability and regeneration of vegetation on dolomite hills

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    A dolomitgyepek nĂ©hĂĄny Ă©ves idƑszakra vonatkozĂł stabilitĂĄsĂĄt ĂĄllandĂł kvadrĂĄtok vizsgĂĄlatĂĄval az Ă©vtizedes lĂ©ptĂ©kƱ stabilitĂĄst egy 80 kvadrĂĄtos adatsor 23 Ă©v utĂĄni ĂșjrafelvĂ©telezĂ©sĂ©nek adatsorĂĄt elemezve igazoltuk. A sziklagyepek tƱz utĂĄni regenerĂĄlĂłdĂĄsĂĄt leĂ©gett feketefenyves helyĂ©n vizsgĂĄltuk. A fajszĂĄm a tƱz utĂĄn 10 Ă©vvel megközelĂ­tette a kontroll terĂŒletekĂ©t, mĂ­g az összborĂ­tĂĄs 15%-kal elmaradt azokĂ©tĂłl. ÖkolĂłgiai spektrumok szerint a 10 Ă©ves gyepek mĂ©g pionĂ­r jellegƱek. 3) A Fraxinus ornus morfolĂłgiai plaszticitĂĄsĂĄt vizsgĂĄlva 7 olyan alaki jellemzƑt talĂĄltunk, amelyek jĂłl leĂ­rjĂĄk a kƑris egyedeket vĂĄltozatos termƑhelyi viszonyok mellett. 4) A feketefenyvesek tƱzveszĂ©lyessĂ©gĂ©nek kutatĂĄsa sorĂĄn vizsgĂĄltuk az Ă©ghetƑ avar felhalmozĂłdĂĄsĂĄt az ĂĄllomĂĄnyok 4 korcsoportjĂĄban. A tƱzgyulladĂĄs valĂłszĂ­nƱsĂ©gĂ©t McArthur modelljĂ©vel elemeztĂŒk. LeggyĂșlĂ©konyabbnak a 60-80 Ă©ves erdƑk mutatkoztak. 5) A feketefenyveseknek a talajra tett hatĂĄsĂĄt vizsgĂĄlva eredmĂ©nyeink nem igazoltĂĄk a feketefenyvesek "talajjavĂ­tĂł hatĂĄsĂĄt". 6) A tƱz rendzinĂĄra tett hatĂĄsĂĄnak Ă©rtĂ©kelĂ©sĂ©re 10 Ă©ve, ill. frissen leĂ©gett feketefenyves terĂŒleteket vizsgĂĄltunk. Elöbbiekben a makroelemek szignifikĂĄnsan magasabb koncentrĂĄciĂłjĂșak a fenyvesek talajĂĄhoz viszonyĂ­tva. A 10 Ă©ve Ă©gett terĂŒletekrƑl kimutattuk, hogy a regenerĂĄlĂłdĂł gyepek talajĂĄban a pH magasabb, a szervesanyag-tartalom viszont alacsonyabb a termĂ©szetközeli sziklagyepekĂ©nĂ©l. | Remarkable stability of dolomite grasslands was proved in both short term (few years) and long terms (two decades) periods. Post-fire regeneration of dolomite grasslands was analysed at burnt Austrian pine stands. 10 years after fire the species number in regenerating grasslands was practically the same as in the control grasslands, however in terms of vegetation cover, life form composition and seed mass spectrum the former grasslands showed pioneer characters. Seeking for a native tree species that could act as substitute for the flammable Austrian pine, we studied manna ash. 7 morphometric variables were determined for satisfactory description of morphological plasticity of manna ash individuals. In the frame of fire risk studies in Austrian pine stands, we determined the litter accumulation in 4 age classes, then, the probability of forest ignition and the fire properties were predicted by McArthur's fire danger model. Results of our pedological studies did not support the (formerly presumed) soil improving role of Austrian pine stands. Effects of fire on rendzina soil was studied in recently burnt and ten-year-old burnt pine plantations. Soil variables at recently burnt sites differed significantly from that of the unburnt stands. In the soil of 10 years old regenerating grasslands pH-value was still higher, whereas organic matter content was still lower than in soils of natural grasslands

    A leukocita Ă©s trombocita funkciĂł vĂĄltozĂĄsok prediktĂ­v Ă©rtĂ©kĂ©nek vizsgĂĄlata intenzĂ­v betegellĂĄtĂĄst igĂ©nylƑ kĂłrkĂ©pekben = Investigation of predictive values of leukocyte and platelet function changes in critically ill patients

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    IntenzĂ­v terĂĄpiĂĄs kezelĂ©st igĂ©nylƑ szĂĄmos kĂłrkĂ©pben közös tĂ©nyezƑ a szervezet szisztĂ©mĂĄs gyulladĂĄsos reakciĂłja, melynek elsƑdleges kivĂĄltĂł oka kĂŒlönbözƑ lehet, de az elƑidĂ©zett vĂĄlaszreakciĂłk nagymĂ©rtĂ©kben hasonlĂłak. A gyulladĂĄsos reakciĂłt a szabadgyökök, citokinek felszaporodĂĄsa, a fehĂ©rvĂ©rsejtek, trombocitĂĄk Ă©s endotĂ©l sejtek aktivĂĄlĂłdĂĄsa kĂ­sĂ©ri. MunkĂĄnk sorĂĄn betegekbƑl vett vĂ©rmintĂĄkban vizsgĂĄltuk az oxidatĂ­v stressz Ă©s a gyulladĂĄsos folyamatok markereinek vĂĄltozĂĄsĂĄt: 1. szĂ­vmƱtĂ©ten ĂĄtesett betegekben; 2. pulmonĂĄlis embĂłliĂĄs betegek trombolĂ­tikus terĂĄpiĂĄja sorĂĄn; 3. alsĂł vĂ©gtagi revaszkularizĂĄciĂłs mƱtĂ©ten ĂĄtesett betegekben; 4. Ă©gĂ©si traumĂĄt szenvedett betegekben; 5. szeptikus betegekben. A kutatĂĄs eredmĂ©nyei Ășjabb ismeretekkel szolgĂĄltak a szervezet szisztĂ©mĂĄs gyulladĂĄsos vĂĄlaszreakciĂłjĂĄban meghatĂĄrozĂł mechanizmusokrĂłl, melyek kĂłrjelzƑ Ă©rtĂ©kkel bĂ­rhatnak, alkalmasak lehetnek a terĂĄpiĂĄs beavatkozĂĄsok hatĂĄsossĂĄgĂĄnak megĂ­tĂ©lĂ©sĂ©re, Ă©s hozzĂĄjĂĄrulhatnak Ășjabb terĂĄpiĂĄs lehetƑsĂ©gek kimunkĂĄlĂĄsĂĄhoz. Az Ășjabb biomarkerek vizsgĂĄlata javĂ­thatja az intenzĂ­v betegellĂĄtĂĄst igĂ©nylƑ betegek korai diagnĂłzisĂĄt, Ă©s ennek következtĂ©ben hatĂĄssal lehet e betegek mortalitĂĄsĂĄra Ă©s morbiditĂĄsĂĄra. EredmĂ©nyeinkrƑl a pĂĄlyĂĄzati periĂłdus alatt 44 kongresszusi elƑadĂĄsban Ă©s 14 megjelent (IF: 15,805) közlemĂ©nyben szĂĄmoltunk be. A pĂĄlyĂĄzatban rĂ©sztvevƑ kutatĂłk közĂŒl ketten PhD fokozatot szereztek. | Surgical trauma, thrombosis, embolism, polytrauma, burn injury may induce systemic inflammatory response syndrome (SIRS). The primary cause of SIRS could be different, but the pathomechanism of the inflammatory response is rather similar, involving oxidative stress, platelet, leukocyte, endothelial cell activation and release of different inflammatory mediators. In this project we investigated the changes of oxidative stress markers and inflammatory mediators in blood samples taken from: 1. patients underwent to open heart surgery with or without extracorporeal circulation; 2. patients with pulmonary embolism underwent to thrombolytic therapy; 3. patients with lower limb revascularization surgery; 4. patients with severe burn injury; 5. patients suffering from sepsis following surgical trauma. By monitoring the oxidative stress parameters, platelet and leukocyte function, adhesion molecule and inflammatory antigen expression, ratio of pro- and antiinflammatory cytokines we searched for markers having predictive value to follow up of patient recovery and leading to set up new therapeutic strategies. The use of biomarkers may improve early diagnosis and therapy in critically ill patients, and may consecutively influence the morbidity and mortality of these patients, and may provide promising decision support for the intensive therapeutics to guide the allocation of hospital resources

    Autonomous neural information processing by a dynamical memristor circuit

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    Analog tunable memristors are widely utilized as artificial synapses in various neural network applications. However, exploiting the dynamical aspects of their conductance change to implement active neurons is still in its infancy, awaiting the realization of efficient neural signal recognition functionalities. Here we experimentally demonstrate an artificial neural information processing unit that can detect a temporal pattern in a very noisy environment, fire a single output spike upon successful detection and reset itself in a fully unsupervised, autonomous manner. This circuit relies on the dynamical operation of only two memristive blocks: a non-volatile Ta2_2O5_5 device and a volatile VO2_2 unit. A fading functionality with exponentially tunable memory time constant enables adaptive operation dynamics, which can be tailored for the targeted temporal pattern recognition task. In the trained circuit false input patterns only induce short-term variations. In contrast, the desired signal activates long-term memory operation of the non-volatile component, which triggers a firing output of the volatile block.Comment: 11 pages, 6 figure

    Stratigraphy, facies and geodynamic settings of Jurassic formations in the BĂŒkk Mountains, North Hungary: its relations with the other areas of the Neotethyan realm.

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    Jurassic mĂ©lange complexes related to the subduction of the Neotethys Ocean occur in the BĂŒkk Mountains, North Hungary. This paper characterizes the sedimentary sequence of basin and slope facies that occur in the southwestern part of the BĂŒkk Mountains, placing special emphasis on the redeposited sedimentary rocks (olistostromes, olistoliths: MĂłnosbĂ©l Group) in order to obtain information on the provenance of the clasts, and the mode and time of their redeposition. The series of formations studied shows a general coarsening-upwards trend. Based on radiolarians and foraminifera, the MĂłnosbĂ©l Group formed in Early to Late Bathonian time. The lower part of the complex is typified by a predominance of pelagic carbonates, shale and radiolarite with andesitic volcaniclastic intercalations. The higher part of the succession is characterized by polymictic olistostromes. Large olistoliths that are predominantly blocks of Bathonian shallow marine limestone (BĂŒkkzsĂ©rc Limestone) appear in the upper part of the sequence. Based on the biostratigraphic and sedimentological data, results of analyses of the redeposited clasts and taking into consideration the concepts of the development of the western Neotethys domain, the evolutionary stages of the sedimentary basins were defined. The onset of the compressional stage led to initiation of nappe stacking that led to the formation of polymict olistostromes and then to the redeposition of large blocks derived from out-of-sequence nappes of the former platform foreland
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