Sclerosis multiplex stroke jellegű tünetekkel: kihívó diagnózis egy eset kapcsán

Absztrakt A stroke jellegű relapsus sclerosis multiplex esetén kihívást jelentő diagnózis, amelynek megállapítására gyors és hatékony döntés szükséges a megfelelő terápia kiválasztása érdekében. A szerzők az eset bemutatása kapcsán a differenciáldiagnosztikai nehézségekre összpontosítanak. A megtévesztő jelek ellenére a lépésenkénti specifikus vizsgálatokra felépített megközelítés felfedte a legvalószínűbb diagnózist és ezáltal az optimális klinikai ellátást. Orv. Hetil., 2015, 156(37), 1514–1518

In situ studies of algal biomass in relation to physicochemical characteristics of the Salt Plains National Wildlife Refuge, Oklahoma, USA

This is the first in a series of experiments designed to characterize the Salt Plains National Wildlife Refuge (SPNWR) ecosystem in northwestern Oklahoma and to catalogue its microbial inhabitants. The SPNWR is the remnant of an ancient ocean, encompassing ~65 km(2 )of variably hypersaline flat land, fed by tributaries of the Arkansas River. Relative algal biomass (i.e., chlorophyll concentrations attributed to Chlorophyll-a-containing oxygenic phototrophs) and physical and chemical parameters were monitored at three permanent stations for a one-year period (July 2000 to July 2001) using a nested block design. Salient features of the flats include annual air temperatures that ranged from -10 to 40°C, and similar to other arid/semi-arid environments, 15–20-degree daily swings were common. Shade is absent from the flats system; intense irradiance and high temperatures (air and sediment surface) resulted in low water availability across the SPNWR, with levels of only ca. 15 % at the sediment surface. Moreover, moderate daily winds were constant (ca. 8–12 km h(-1)), sometimes achieving maximum speeds of up to 137 km h(-1). Typical of freshwater systems, orthophosphate (PO(4)(3-)) concentrations were low, ranging from 0.04 to <1 μM; dissolved inorganic nitrogen levels were high, but spatially variable, ranging from ca. 250–600 μM (NO(3)(- )+ NO(2)(-)) and 4–166 μM (NH(4)(+)). Phototroph abundance was likely tied to nutrient availability, with high-nutrient sites exhibiting high Chl-a levels (ca. 1.46 mg m(-2)). Despite these harsh conditions, the phototrophic microbial community was unexpectedly diverse. Preliminary attempts to isolate and identify oxygenic phototrophs from SPNWR water and soil samples yielded 47 species from 20 taxa and 3 divisions. Our data indicate that highly variable, extreme environments might support phototrophic microbial communities characterized by higher species diversity than previously assumed

PLA 3D nyomtatószál anizoterm DSC vizsgálata = Non-Isotherm Testing of PLA Filament of 3D Printing by DSC

DSC vizsgálatunkhoz PLA-t választottunk, ami egy gyakran használt alapanyag 3D nyomtatáshoz. A PLA részben kristályos polimer. A kristályos anyagok szerkezetének változása nyomon követhető DSC vizsgálattal, mert érzékenyek a fűtés-hűtés változásaira. Változtattuk a felfűtés és a lehűtés sebességeit több lépcsőben és vizsgáltuk milyen hatást gyakorol az olvadási és a kristályosodási folyamatokra

A kozmikus sugárzás hatása a polimerek termikus tulajdonságaira = The Influence of Cosmic Radiation on the Thermal Properties of Different Polymers

A kutatás során a kozmikus sugárzás hatását vizsgáltuk különböző polimereken. Polipropilén, poliamid 6.6 és polikarbonát alapanyagból fröccsöntési eljárással készült próbatesteket eltérő repülési magasságú repülőgépeken elkülönítve szállíttattunk. Termikus tulajdonságaikat vizsgáltuk DSC és TGA eljárásokkal. Az eredmények alapján feltételezhetően változások következtek be egyes polimerek termikus tulajdonságaiban a sugárzás hatására

A review on MWCNTS: the effect of its addition on the polymer matrix

In recent years, it has been realized that nanocomposite materials are candidates for many applications in all fields due to their unique properties. This review aims to study the possibility of modifying some properties of polymers by adding carbon nanotubes to improve their properties by taking advantage of the large surface area of MWCNTs to volume ratio. For this purpose, multi-walled carbon nanotubes were used at different ratios and by different mixing methods. Then the effect of this addition was monitored by the procedure of some mechanical, electrical and thermal measurements of the resulting nanocomposite materials. The results of the tests showed that the quality of the filling depends on the way it is distributed within the polymer matrix, where the homogeneous dispersion of MWCNTs will reflect on the properties of the nanocomposite material thus benefit from the special properties of it. Also, the results showed that the addition of MWCNTs at low ratios achieved uniform distribution and dispersion, so improved the properties of the materials such as tensile strength, elongation at break and young's modulus. The ratio of 0.5 wt % of MWCNTs represented an average value for adding MWCNTs to various types of polymers. These composite nanomaterials can replace other industrial materials in many applications

Cooperation and partner choice among Agta hunter-gatherer children: An evolutionary developmental perspective

Examining development is essential for a full understanding of behaviour, including how individuals acquire traits and how adaptive evolutionary forces shape these processes. The present study explores the development of cooperative behaviour among the Agta, a Filipino hunter-gatherer population. A simple resource allocation game assessing both levels of cooperation (how much children shared) and patterns of partner choice (who they shared with) was played with 179 children between the ages of 3 and 18. Children were given five resources (candies) and for each was asked whether to keep it for themselves or share with someone else, and if so, who this was. Between-camp variation in children’s cooperative behaviour was substantial, and the only strong predictor of children’s cooperation was the average level of cooperation among adults in camp; that is, children were more cooperative in camps where adults were more cooperative. Neither age, sex, relatedness or parental levels of cooperation were strongly associated with the amount children shared. Children preferentially shared with close kin (especially siblings), although older children increasingly shared with less-related individuals. Findings are discussed in terms of their implications for understanding cross-cultural patterns of children’s cooperation, and broader links with human cooperative childcare and life history evolution

Research in the mechanization of black locust renewal and planting

Nowadays, the black locust (Robinia pseudoacacia) is the most current and the most widely used tree species in Hungary. Due to its penetration and the wide variety of application it’s worth to examine the different mechanization options of the reforestation technologies and their costs. We provided our research in the area of Nyírerdő Nyírségi Erdészeti Zrt. According to the tests it can be said, that the cost of the reforestations with root ripping is the most favourable and the reforestation or regeneration with planting costs the most. The disadvantage of the regeneration with root ripping is, that after its multiple application it can be observed the significantly degradation of the assortment composition and of the tree utilization income