Nova totius terrarum orbis geographica ac hydrographica tabula

Julkaisussa: Novus Atlas. Vol. I

Livoniae pronvinciae ac eius confinium verus et elegans typus

Julkaisussa: Speculum orbis terrae. Vol. II

Isles Ac��ores, Irlande, Portugal

Julkaisussa: Nouvel atlas du globe terrestre represente�� en une carte ge��ne��rale et XII cartes particulie��res avec une courte description

Mare Baikal cum partibus fluviorum Lenae, Argun Selengae et Angarae ac circumjacentibus territoriis

Kartta kuuluu A. E. Nordenskio��ldin kokoelmaan

Minimizing Conducted RF-Emissions in Switch Mode Power Supplies Using Spread-Spectrum Techniques

Switching power supplies are usually implemented with a control circuitry that uses constant clock frequency turning the power semiconductor switches on and off. A drawback of this customary operating principle is that the switching frequency and harmonic frequencies are present in both the conducted and radiated EMI spectrum of the power converter. Various variable-frequency techniques have been introduced during the last decade to overcome the EMC problem. The main objective of this study was to compare the EMI and steady-state performance of a switch mode power supply with different spread-spectrum/variable-frequency methods. Another goal was to find out suitable tools for the variable-frequency EMI analysis. This thesis can be divided into three main parts: Firstly, some aspects of spectral estimation and measurement are presented. Secondly, selected spread spectrum generation techniques are presented with simulations and background information. Finally, simulations and prototype measurements from the EMC and the steady-state performance are carried out in the last part of this work. Combination of the autocorrelation function, the Welch spectrum estimate and the spectrogram were used as a substitute for ordinary Fourier methods in the EMC analysis. It was also shown that the switching function can be used in preliminary EMC analysis of a SMPS and the spectrum and autocorrelation sequence of a switching function correlates with the final EMI spectrum. This work is based on numerous simulations and measurements made with the prototype. All these simulations and measurements are made with the boost DC/DC converter. Four different variable-frequency modulation techniques in six different configurations were analyzed and the EMI performance was compared to the constant frequency operation. Output voltage and input current waveforms were also analyzed in time domain to see the effect of the spread spectrum operation on these quantities. According to the results presented in this work, spread spectrum modulation can be utilized in power converter for EMI mitigation. The results from steady-state voltage measurements show, that the variable-frequency operation of the SMPS has effect on the voltage ripple, but the ripple measured from the prototype is still acceptable in some applications. Both current and voltage ripple can be controlled with proper main circuit and controller design.

Antioxidant and free radical scavenging effects in extracts of the medicinal herb Achyrocline satureioides (Lam.) DC. ("marcela")

Achyrocline satureioides (Lam.) DC. (Compositae) is a medicinal herb used in Argentina, Uruguay, Brazil and Paraguay for its choleretic, antispasmodic and hepatoprotective properties. The presence of the flavonoid quercetin and its derivatives, and of different phenolic acids such as caffeic, chlorogenic and isochlorogenic acids in the aerial parts of this plant has led us to study the antioxidant activity of its extracts using different bioassays. The inhibition of luminol-enhanced chemiluminescence by the aqueous and methanolic extracts was used to show that their total reactive antioxidant potential index (TRAP; in ��M Trolox equivalents) was 91.0 �� 15.4 and 128.1 �� 20.1 ��M, respectively, while the total antioxidant reactivity index (TAR) was calculated to be 1537 �� 148 and 1910 �� 171 ��M. Only the methanolic extract was capable of reducing iron (II)-dependent DNA damage. Lipid peroxidation was assessed by two different methods. The aqueous extract reduced hydroperoxide-initiated chemiluminescence in rat liver homogenates at all concentrations in a dose-dependent manner, with a calculated IC50 = 225 ��g/ml, while the methanolic extract was only effective at higher concentrations (100 and 1000 ��g/ml). Both aqueous and methanolic extracts were capable of reducing the production of thiobarbituric acid reactive substances (TBARS) in rat liver homogenates, with an IC50 >1000 ��g/ml. The results obtained suggest that the extracts of A. satureioides possess significant free radical scavenging and antioxidant activity in vitro, a fact that should encourage future in vivo studies.

Preparation and purification of Flavobacterium heparinum chondroitinases AC and B by hydrophobic interaction chromatography

Flavobacterium heparinum is a soil bacterium that produces several mucopolysaccharidases such as heparinase, heparitinases I and II, and chondroitinases AC, B, C and ABC. The purpose of the present study was to optimize the preparation of F. heparinum chondroitinases, which are very useful tools for the identification and structural characterization of chondroitin and dermatan sulfates. We observed that during the routine procedure for cell disruption (ultrasound, 100 kHz, 5 min) some of the chondroitinase B activity was lost. Using milder conditions (2 min), most of the chondroitinase B and AC protein was solubilized and the enzyme activities were preserved. Tryptic soy broth without glucose was the best culture medium both for bacterial growth and enzyme induction. Chondroitinases AC and B were separated from each other and also from glucuronidases and sulfatases by hydrophobic interaction chromatography on HP Phenyl-Sepharose. A rapid method for screening of the column fractions was also developed based on the metachromatic shift of the color of dimethylmethylene blue.

Orbis terrae compendiosa descriptio : quam ex Magna Universali Gerardi Mercatoris domino Richardo Gartho, geographiae ac caeterarum bonarum artium amatori ac fautori summo, in veteris amicitiae ac familiaritatis memoriam

Kartta kuuluu A. E. Nordenskio��ldin kokoelmaan

Europa religionis christianiae morum et pacis ac belli artium cultu omnium terrarum orbis partium praestantiss.

Kartta kuuluu A. E. Nordenskio��ldin kokoelmaan

Evaluation of the antiedematogenic activity of artemetin isolated from Cordia curassavica DC

The species Cordia curassavica (Boraginaceae), known popularly as "erva baleeira", is used in folk medicine for the treatment of several inflammatory processes and as a healing agent. The objective of the present study was to evaluate the antiedematogenic activity of crude dichloromethane extracts of Cordia curassavica and of the artemetin-enriched fraction. The crude extract and artemetin fraction were tested in the model of carrageenin-induced paw edema in male Swiss mice (25-30 g). The crude dichloromethane extract (300 and 1000 mg/kg, po, N = 6) showed significant antiedematogenic activity, reducing the edema by 42, 57 and 45% and 46, 62 and 69%, 3, 4 and 5 h after carrageenin administration, respectively. Indomethacin (10 mg/kg, po, N = 6) reduced the edema by 45 and 48%, after 4 and 5 h, but the artemetin-enriched fraction (30, 100 and 300 mg/kg, po, N = 6) had no activity. The dichloromethane extract (300 and 1000 mg/kg, po, N = 6) also showed antinociceptive activity by reducing acetic acid-induced writhing in mice from 37.1 �� 2.28 (control) to 17.3 �� 1.34 and 13.2 �� 1.44, respectively, but had no activity in the hot-plate test.

Nova et accuratissima tabula regionum ad Sinum Finnicum. Exactissimo delineata ac sumneo studio recognito ab Henrico de Leth.

[N. 1:1200000].

Europa religionis christianae, morum, et pacis ac belli artium cultu omnium terrar: orbis partiu[m] praesanti��: juxta recent[issi]ma exempl: accurat[issi]ma excusa a Matth. Seuttero s. c. m. geogr.

[N. 1:27000000].

Nova mappa geographica Sueciae ac Gothiae regna ut et Finlandiae ducatum ac Lapponiam, cum provinciis minoribus, ob oculos ponens, cura et sumtibus Tobiae Conradi Lotter, chalcogr et geogr: Augustae Vindel.

Alareunassa privilegiomerkint��: Cum gratia et privil. s. r. i. vicariatq, in partibq Rheni, Sveviae, et juris Franconici.

Fons lacrymarum Sveo-Gothicae gentis, per theoriam solis ad d. April. 5 anni M.DC.XCVII

Jehovah auxiliante!

De Spiritu Sancto, et aeterna eius divinitate ac processione; nec non officio atque donis

Invokaatio: Sun to Theo trisbeltiso kai megiso.