Miracle-dz/UniFAR-FTUs huggingface dataset:
Pengaruh Model Pembelajaran Inkuiri Terbimbing Berbantuan Media Benda Konkret Terhadap Sikap Ilmiah dan Hasil Belajar IPA

Penelitian ini bertujuan untuk mengetahui pengaruh yang signifikan model pembelajaran inkuiri terbimbing berbantuan media benda konkret terhadap sikap ilmiah dan hasil belajar IPA siswa. Jenis penelitian ini adalah penelitian eksperimen semu dengan desain non equivalenpost-test only control group design. Populasi dalam penelitian ini adalah seluruh siswa kelas V SD Gugus IV Kecamatan Buleleng Tahun Pelajaran 2017/2018 berjumlah 155 orang.Sampel penelitian ini diambil dengan teknik clusterrandom sampling. Sampel penelitian ini yaitu siswa kelas V SD N 3 Penglatan yang berjumlah 23 orang dan siswa kelas V SD N 3 Alasangker yang berjumlah 20 orang.Data sikap ilmiah dikumpulkan dengan metode non tes menggunakan instrumen kuisioner sikap ilmiah dan data hasil belajar IPA dikumpulkan dengan metode tes menggunakan tes pilihan ganda. Data yang dikumpulkan, dianalisis menggunakan statistis deskriptif dan Manova.Hasil penelitian menunjukkan: (1) terdapat perbedaan yang signifikan sikap ilmiah antarasiswa yang mengikuti model pembelajaran inkuiri terbimbing berbantuan media benda konkret dengan pembelajaran konvensional (Fhitung=25,88>Ftabel=4,08), (2) terdapat perbedaanyang signifikan hasil belajar IPA antarasiswa yang mengikuti model pembelajaran inkuiri terbimbing berbantuan media benda konkret dengan pembelajaran konvensional(Fhitung =15,16> Ftabel = 4,08), dan (3) secara bersama-sama,terdapat perbedaan yang signifikan sikap ilmiah dan hasil belajar IPA antara siswa yang mengikuti model inkuiri terbimbing berbantuan media benda konkret dengan pembelajaran konvensional(F=15,111; p<0,05). Hal ini menunjukkan pembelajaran menggunakan model pembelajaran inkuiri terbimbing berbantuan media benda konkret berpengaruh positif terhadap sikap ilmiah dan hasil belajar IPA siswa.
Angiotensin II-induced vasodilation: role of bradykinin, NO and endothelium-derived hyperpolarizing factors

textabstractInteractie tussen AT1 en a1-adrenerge receptoren (Hoofdstuk 6) Carvedilol, de selectieve s1-adrenoceptor antagonist metoprolol, de niet-selectieve sadrenoceptor antagonist propranolol, en de a1-adrenoceptor antagonist prazosin beinvloedden geen van allen de constrictoire respons van HCMA’s op Ang II. Ang II, na toevoeging aan het orgaan bad in een lage (non-constrictoire) concentratie, versterkte de respons op de a1-adrenoceptor agonist fenylefrine enorm. Zowel carvedilol als de AT1 receptor antagonist irbesartan remden deze door Ang II geinduceerde potentiatie. Carvedilol remde eveneens de door Ang II versterkte ophoping van inositolfosfaten onder invloed van fenylefrine in hartspiercellen. Samenvattend kan gesteld worden dat AT1-a1-receptor ‘crosstalk’, mogelijk via inositolfosfaten, HCMA’s gevoeliger maakt voor a1-adrenoceptor agonisten. De a1-adrenoceptor blokkerende effecten van carvedilol zorgen er voor dat carvedilol dit potentierende effect van Ang II tegen kan gaan. Dit verklaart waarom het bloeddrukverhogende effect van Ang II bij patienten met hartfalen die behandeld worden met carvedilol kleiner is dan bij patienten die behandeld worden met metoprolol.
AMINO ACID AND TRACE ELEMENT CONTENT OF MEAT FROM GUINEA-FOWL /NUMIDA MELEAGRIS/ FATTENED TO DIFFERENT AGES

A study of the amino acid composition and the content of the major biogenic trace elements of meat from a local population of guinea-fowl (Numida meleagris) fattened to different ages (16 and 20 weeks) was carried out.Depending on the fattening period duration and the bird sex, the following levels of essential amino acids were established: 50,66-54,29 in the breast muscle and 44,11-47,49% in the thigh muscle, respectively. The nonessential amino acids varied within 33,66-36,10% in the breast muscle and 36,09-38,79 in the thigh muscle. Among the essential amino acids, the highest content of lysine was found in the breast muscle: from 7,57 ± 0,16 to 8,11 ± 0,10, followed by that of leucine: 7,21 ± 0,15 – 7,73 ± 0,10 and arginine: 6, 90 ± 0,14 – 7,39 ± 0,09%. Breast muscle is a good source of methionine: 4,92 ± 0,10 – 5,28 ± 0,07%, depending on the age and sex of the birds.Among the essential amino acids in the thigh muscle, again the highest percentage of lysine was established: 7,37 ± 0,13 to 7,88 ± 0,07, followed by arginine: 6,50 ± 0,12 to 7,06 ± 0,07 and leucine: 6,34 ± 0,11 to 6,83 ± 0,06%. The thigh muscle of that bird species is relatively poor in the sulfur-containing amino acid methionine: 3,96 ± 0,07 to 4,32 ± 0,04%, compared to the breast muscle.Among the nonessential amino acids, the highest percentages were established for glutamine and asparagine both in the breast and thigh muscle: 11,45 ± 0,24 to 12,37 ± 0,14 of glutamine and 8,47 ± 0,22 to 12,37 ± 0,14% of asparagine in the breast muscle and 11,44 ± 0,21 to 12,27 ± 0,11 of glutamine and 7.74 ± 0.14 to 8,31 ± 0.08% of asparagine in the thigh muscle, respectively.High levels of iron were found in the guinea-fowl meat: from 10.90 to 12.67 mg/kg in the breast muscle and from 16,84 to 18,92 mg/kg in the thigh muscle, depending on the sex. Thigh muscle is characterized by a high zinc content of 21,51 to 22,34 versus 7,98 – 9,18 mg/kg in the breast muscle, depending on the sex of the birds. The phosphorus content varied within a narrow range (0,25-0,26 in the thigh muscle and 0,27-0,28% in the breast muscle) and it is not significantly influenced by the sex of the guinea-fowls.
Fullerene C80: Are there still more isomers?

A theoretical investigation of fullerene C80 using density functional theory is presented. Following the isolated pentagon rule (IPR), seven different topologies are considered. Calculated energy differences are less than 30 kJ/mol except for Ih topology which is more unstable. Isomers of D5d, C2v(I), and D2 topology are found to have singlet ground states. Calculated nuclear magnetic resonance and electronic absorption spectra allow to identify the two known isomers as D2 and D5d, in agreement with previous assignments. The absolute configuration of the chiral D2 isomer is predicted by means of the calculated electronic circular dichroism spectrum. The results further suggest that the C2v(I) isomer might be accessible from soots. All other IPR isomers are either diradicals or have nearly zero singlet–triplet splittings. These species are expected to polymerize, forming insoluble solids. The classification of fullerenes according to their gap is analyzed, and computational methods for treating small gap c.
Postharvest chemical, sensorial and physical-mechanical properties of wild apricot (Prunus armeniaca L.).

Some chemical, sensorial and physical-mechanical properties of 19 apricot genotypes and Hungarian Best (control) such as moisture content, soluble solids content, titratable acidity ratio and their ratio, fruit and stone mass, flesh/stone ratio, fruit dimensions (length, width, thickness), arithmetic and geometric mean diameter, sphericity, surface area and aspect ratio were determined. Their application is also discussed. The highest moisture content and stone mass observed in X-1/1/04 and X-1/2/04, soluble solids content in ZO-1/03, titratable acidity in ZL-2/03, SS/TA ratio in ZL-1/03, and fruit mass and flesh/stone ratio in DL-1/1/04 genotype. The most number of genotypes have orange and deep orange skin and flesh colour, respectively, whereas sweet kernel taste was predominant in most genotypes. Regarding physical-mechanical properties, the superior fruit dimensions (length, width, thickness), arithmetic and geometric mean diameter and surface area observed in DL-1/1/04 genotype, whereas the highest sphericity and surface area observed in X-1/1/04 and X-1/2/04 genotypes. Also, the series of genotypes evaluated have better chemical, sensorial and physical-mechanical properties than Hungarian Best (control). Finally, information about these properties is very important for understanding the behaviour of the product during the postharvest operations.
Investigation of Transition Scenarios in Boundary-Layer Flows

Laminar-turbulent transition mechanisms triggered by crossflow instability in three-dimensional, accelerated boundary-layer flows are investigated using numerical methods of stability anaylsis. The investigations are based on the DLR swept plate experiment, where stationary and traveling crossflow modes can be selectively introduced into the flow field. Nonlinear instability analyses employing the parabolized stability equations (PSE) show that unique saturation amplitudes do neither exist for stationary crossfow vormeans of a spatial bifurcation model. Using Floquet theory, temporal secondary instability analyses are then performed for the mean flow distorted by primary disturbances .
Hollow TS-1 mesocrystals: hydrothermal construction and high catalytic performances in cyclohexanone ammoximation

In this article, solid and hollow TS-1 mesocrystals (HTMs) with hierarchical porous structures were constructed through assembling TS-1 nanocrystalline blocks in a hydrothermal post-treatment method. TS-1 nanocrystalline blocks including the organic templating reagent provided solid TS-1 mesocrystals. Pre-removal of the template offered HTMs. In cyclohexanone ammoximation, the catalytic activity of HTMs depended significantly on their hollow mesocrystalline structure. Compared to solid TS-1 mesocrystals, HTMs showed excellent catalytic performances for cyclohexanone conversion with oxime selectivity up to 100%. The hollow mesocrystalline structures of TS-1 contributed to high surface areas, hierarchical porosities, robust structures, and corresponding catalytic performances.
Inhibitive and adsorption properties of ethanol extract of Hibiscus sabdariffa calyx for the corrosion of mild steel in 0.1 M HCl

Abstract The inhibitive and adsorption properties of ethanol extract of Hibiscus sabdariffa calyx were studied using gravimetric, gasometric, thermometric, and Fourier transform infrared methods of monitoring corrosion. The results obtained indicated that ethanol extract of Hibiscus sabdariffa calyx is a good adsorption inhibitor for the corrosion of mild steel in HCl solutions. The adsorption of the inhibitor on mild steel surface is spontaneous and supports the Langmuir adsorption model. From the calculated values of free energy of adsorption, the activation energy, and the variation of inhibition efficiency with temperature, it can be concluded that the initial mechanism for the adsorption of ethanol extract of Hibiscus sabdariffa calyx on mild steel surface is physical adsorption. Analysis of spectra obtained from the Fourier transform infrared spectrophotometer indicated that there is an interaction between iron in mild steel and the inhibitor.
Silica–alumina catalysts prepared in sol–gel process of TEOS with organic additives

Amorphous silica–alumina catalysts were prepared in the sol–gel reaction of tetraethoxysilane in the presence of aluminium nitrate and various organic additives, and the effects of the additives on both pore formation and acid-site generation were investigated. Macropores with bicontinuous morphology are formed in the system with poly(ethylene oxide) (PEO) with an average molecular weight of 10 0000, when a transitional structure of spinodal decomposition is fixed by sol–gel transition of inorganic components. In the systems with other organic additives with low molecular weight, such as ethylene glycol oligomers and citric acid, silica–alumina is provided with only mesopores. Although their mesopore structures are not affected by organic additives, the catalytic activity varies depending on the kind of organic additives. It is found that organic additives with the ability to increase the interaction between silica oligomers and aluminium cations increase the dispersion of Al in the silica network, resulting in high catalytic activity in the cracking of cumene. PEO interacts with both silica and aluminium cations in the sol–gel solution, so that macroporous silica–alumina prepared in the presence of PEO shows excellent catalytic activity.
Limits and Sites of Lysinoalanine Formation in Lysozyme, α-Lactalbumin and αs1- and β-Caseins by Alkali Treatment

Lysinoalanine was determined by gas chromatography. Lysinoalanine formation in lysozyme depended on alkali concentration, pH, temperature and exposure time. The upper limits of lysinoalanine formation in lysozyme and α-lactalbumin were related to the number of lysine residues with a cystine disulfide bond in the adjacent position rather than the individual contents of these residues. In cases of αsl- and β-caseins, the upper limits were related to the number of phosphoserine residues, regardless of their sequential relationship to lysine residues. Gel electrophoresis suggested that intermolecular cross-linking took place in the α-lactalbumin and caseins.
EFFECT OF WATER HYACINTH LEAVES (EICHHORNIA CRASSIPES) SUBSTITUTION WITH MAIZE ON SOME GROWTH PARAMETERS OF COMMON CARP

This study was conducted to Knowing the effect of using dried Water hyacinth leaves instead of maize in the feeding of common carp Cyprinus carpio L. 60 fish with an average weight of 27 ± 1 g/fish were randomly distributed on six replicates. Five similar proteins were produced with protein content and different levels of use of Water hyacinth leaf powder (5%, 10%, 15%, 20%, 25%). treatments (T2, T3, T4, T5 and T6) respectively, as well as T1 control, which is free of Water hyacinth leaf powder, Fish were fed on experimental treatments by 3% of their weight. The experiment lasted for 90 days. Growth parameters were used to evaluated ration effect on fish performance as weight gain, Relative growth rate, Specific growth rate, Food conversion ratio and Food conversion efficiency. The results showed that the best experimental diets was T4 which gave the higher levels for most studied parameters . There were significant differences (p≥ 0.01) between it and T1 control treatment on most studied parameters. The fish were fed diet of T4 gave higher rate of weight gain (32.72 ± 0.07) gm/fish, and the lowest weight gain for fish of T6 ( 18.30 ± 0.10) g / fish , T4 was the highest relative growth rate (104.72 ± 0.07)% and did not differ significantly from what was recorded by the rest treatments. While T4 recorded the highest value of Specific growth rate amount to (0.80 ± 0.00)%. The best food conversion rate was to T4 (3.51 ± 0.00) gm. The study showed that common carp fish can feed on not more than 20% of Water hyacinth leaves powder
Physicochemical characteristics of food lipids and proteins at fluid-fluid interfaces

In this paper we are concerned with adsorption, structure, morphology, and dynamic properties of food dairy proteins (β-casein, caseinate, and whey protein isolate (WPI)) and water-insoluble lipids (monopalmitin and monoolein) at the air-water and oil-water interfaces. Combined surface chemistry (surface film balance and dynamic tensiometry) and microscopy (Brewster angle microscopy (BAM)) techniques have been used to determine the adsorption, structure, morphology, relative film thickness, relaxation phenomena, and dilatational rheological characteristics of emulsifiers (proteins and lipids) at fluid-fluid interfaces, including the effect of temperature. The derived information shows that protein and lipid type and temperature affect the interfacial characteristics. The nature of emulsifier (protein or lipid) interactions at the interface has an important role in their physicochemical characteristics. Important functional differences have been established between proteins and lipids, and between globular (WPI) and disordered (β-casein and caseinate) proteins.
Indigenous aliphatic amines in the aqueously altered Orgueil meteorite

The CI1 Orgueil meteorite is a highly aqueously altered carbonaceous chondrite. It has been extensively studied, and despite its extensive degree of aqueous alteration and some documented instances of contamination, several indigenous organic compounds including amino acids, carboxylic acids, and nucleobases have been detected in its carbon‐rich matrix. We recently developed a novel gas chromatographic method for the enantiomeric and compound‐specific isotopic analyses of meteoritic aliphatic monoamines in extracts and have now applied this method to investigate the monoamine content in Orgueil. We detected 12 amines in Orgueil, with concentrations ranging from 1.1 to 332 nmol g−1 of meteorite and compared this amine content in Orgueil with that of the CM2 Murchison meteorite, which experienced less parent‐body aqueous alteration. Methylamine is four times more abundant in Orgueil than in Murchison. As with other species, the amine content in Orgueil extracts shows less structural diversity than that in Murchison extracts. We measured the compound‐specific stable carbon isotopic ratios (δ13C) for 5 of the 12 monoamines detected in Orgueil and found a range of δ13C values from –20 to +59‰. These δ13C values fall into the range of other meteoritic organic compounds, although they are 13C‐depleted relative to their counterparts extracted from the Murchison meteorite. In addition, we measured the enantiomeric composition for the chiral monoamines (R)‐ and (S)‐sec‐butylamine in Orgueil, and found it was racemic within experimental error, in contrast with the l‐enantiomeric excess found for its amino acid structural analog isovaline. The racemic nature of sec‐butylamine in Orgueil was comparable to that previously observed in Murchison, and to other CM2 and CR2 carbonaceous chondrites measured in this work (ALH 83100 [CM1/2], LON 94101 [CM2], LEW 90500 [CM2], LAP 02342 [CR2], and GRA 95229 [CR2]). These results allow us to place some constraints on the effects of aqueous alteration observed over the monoamine concentrations in Orgueil and Murchison, and to evaluate the primordial synthetic relationships between meteoritic monoamines and amino acids.
Characterization of electrical discharge machining plasmas

Electrical Discharge Machining (EDM) is a well-known machining technique since more than fifty years. Its principle is to use the eroding effect on the electrodes of successive electric spark discharges created in a dielectric liquid. EDM is nowadays widely-used in a large number of industrial areas. Nevertheless, few studies have been done on the discharge itself and on the plasma created during this process. Further improvements of EDM, especially for micro-machining, require a better control and understanding of the discharge and of its interaction with the electrodes. In this work, the different phases of the EDM process and the properties of the EDM plasma have been systematically investigated with electrical measurements, with imaging and with time- and spatially-resolved optical emission spectroscopy. The pre-breakdown phase in water is characterized by the generation of numerous small hydrogen bubbles, created by electrolysis. Since streamers propagate more easily in a gaseous medium, these bubbles can facilitate the breakdown process. In oil, no bubbles are observed. Therefore, the breakdown mechanism in oil could be rather enhanced by particles present in the electrode gap. Fast pulses of current and light are simultaneously measured during the pre-breakdown. These pulses are characteristic of the propagation of streamers in the dielectric liquid. The pre-breakdown duration is not constant for given discharge parameters, but distributed following a Weibull distribution. This shows that the breakdown is of stochastic nature. After the breakdown, the plasma develops very rapidly ( 2·1018 cm-3 during the first microsecond). Then it decreases with time, remaining nevertheless above 1016 cm-3 after 50 μs. During the whole discharge, the density is slightly higher in the plasma center. The EDM plasma has such a high density because it is formed from a liquid, and because it is constantly submitted to the pressure imposed by the surrounding liquid. This extreme density produces spectra with strongly-broadened spectral lines, especially the Hα line, and with an important continuum. During the first microsecond when the density is at its maximum, spectral lines are so broadened that they are all merged into a continuum. The low temperature and the high density of the EDM plasma make it weakly non-ideal. Its typical coupling parameter Γ is indeed around 0.3, reaching 0.45 during the first microsecond. In this plasma, the Coulomb interactions between the charged particles are thus of the same order as the mean thermal energy of the particles, which produces coupling phenomena. Spectroscopic results confirm the non-ideality of the EDM plasma. The strong broadening and shift of the Hα line and its asymmetric shape and complex structure, the absence of the Hβ line, and the merging of spectral lines are typical of nonideal plasmas. The EDM plasma has thus extreme physical properties, and the physics involved is astonishingly complex.
Evaluation of soil extraction methods for uranium

Als naturlicher Bestandteil liegt Uran (U) in Boden in geringer Konzentration (0,3 bis 12.0 mg kg-1 U) vor. In landwirtschaftliche Boden erfolgt ein zusatzlicher U-Eintrag durch P-Dunger. U-Extraktionsverfahren wurden aus herkommlichen Schwermetall-extraktionsverfahren evaluiert und hinsichtlich ihres Extraktionspotentials verglichen. Die wichtigsten Parameter, die die Bioverfugbarkeit von U fur Pflanzen in unterschiedlich U-kontaminierten Boden beeinflussen, werden diskutiert. Vier Gruppen von Bodenproben wurden untersucht, die den weiten Bereich praktisch moglicher U-Konzentrationen abdeckten. Sie entstammten vorherigen Gefas- und Inkubationsversuchen, zwei P-Dauerdungungsversuchen sowie einer Bergbauregion in Schneeberg (Sachsen, Deutschland). Fur die Extraktion wurden AAAc-EDTA, DTPA, NH4Ac ( pH 7,0) sowie durch Zentrifugation gewonnene Bodenlosung eingesetzt. Der U-Gehalt in den Extraktionslosungen wurde mittels ICP-QMS gemessen und mit den Pflanzen-U-Gehalten des vorhergehenden Experiments korreliert. Die gepruften Extraktionsmittel unterschieden sich hinsichtlich ihres Extraktionspotentials, wobei mit AAAC-EDTA die grosten U-Mengen extrahiert werden konnten, wahrend in der Bodenlosung erwartungsgemas am wenigsten pflanzenaufnehmbares U nachgewiesen wurde. Die Vorhersagegenauigkeit fur die U-Aufnahme durch Pflanzen war vom verwendeten Extraktionsmittel und der Pflanzenart abhangig. Die U-Aufnahme durch Zea mays L. und Helianthus annuus L. korrelierte am besten mit dem AAAc-EDTA-extrahierbaren U. Die U-Aufnahme von Vicia faba L. konnte mit keinem der verwendeten Extraktionsmittel eingeschatzt werden. Der U-Gesamtgehalt, der pH-Wert und P-Verbindungen im Boden beeinflussten Extrahierbarkeit und Pflanzenaufnehmbarkeit des Schwermetalls U. Zusatzlich wurde der Einfluss von N- und S-Dungung auf die U-Aufnahme durch Pflanzen untersucht. Die Lagerungszeit der U-kontaminierten Bodenproben hatte ebenfalls einen Einfluss auf die Menge an extrahierbarem U.
DETERMINATION OF ZEARALENONE BY THE CAPILLARY ZONE ELECTROPHORESIS-UV DETECTION AND ITS APPLICATION TO POULTRY FEED AND CEREALS

A capillary zone electrophoretic method for the determination of zearalenone is described in this study. In the separation, a run buffer consisting of 20 mM sodium tetraborate at pH 9.0 with 15% acetonitrile applying 15 kV, injecting 10 s at 50 mbar was utilized. Phenobarbital was a suitable internal standard and the signals were recorded at 254 nm. Zearalanon and internal standard appeared at 5.46 min (RSD% 0.20) and 6.35 min (RSD% 0.18), respectively. The repeatability results are in the range of 0.01–1.58 for inter-day. The linearity was investigated in the range of 5.20 × 10−7 M to 7.86 × 10−5 M ZEA and it was linear fitting to the equation of [rPN = 244803.8 C(M) −0.0348; r = 0.9999]. The LOD and LOQ were calculated to be 2.70 × 10−8 M (8.25 µg/L) and 8.17 × 10−8 M (25 µg/L), respectively. Then, the method was successfully applied to the analysis of ZEA in poultry feeds, flour of maize, grain, and certain cereal samples such as fibrous biscuit, popcorn, and rice crisp.