Tunneling giant magnetoresistance in coevaporated Fex(SiO)1−x thin films

International audienceFe x (SiO) 1x thin films, with volume fraction x ranging from 0.04 to 0.6, have been prepared by coevaporation. Magnetization, resistivity, and magnetoresistance measurements show that the behavior of this composite is metallic like for x0.35. For 0.2x0.27, the confrontation of all measurements prove the existence of a tunneling giant magnetoresistance between ferromagnetic grains at T300 K, where the mean radius of the grains is estimated to be about 1 nm

Magnetic and transport properties of evaporated Fe/SiO multilayers

International audienceFe/SiO discontinuous multilayers consisting of layers of Fe particles embedded in an insulating SiO matrix have been prepared by evaporation. Their structural, magnetic, and transport properties have been studied as a function of Fe and SiO thickness. For small iron thicknesses, magnetic measurements show a superparamagnetic behavior above a blocking temperature determined by field-cooled and zero-field-cooled magnetization curves. Negative magnetoresistance due to spin-dependent tunneling has been observed in both current-in-plane and current-perpendicular-to-the-plane geometries. For the smaller iron thickness 5 Å͒, a Coulomb blockade effect is observed at low temperature together with an increase of the magnetoresistance

PALM OIL REPLACEMENT BY KEPAYANG OIL (Pangium edule Reinw) IN DIETS ON THE QUAIL GROWTH PERFORMANCES

ABSTRACT Currently, the utilization of palm oil as a feed ingredient competes with human needs; thus, we must explore new sources of oil that may be used as alternative feed. Kepayang oil is a new form of feed oil due to its high content of unsaturated fatty acids, which helps in quail growth. The goal of this investigation is to see how replacing palm oil in rations with kepayang oil affects quail growth. The study used 200 female quail 21 days old, kepayang oil, commercial palm oil, mineral mix, maize meal, fish meal, bran, soy cake, lysine, methionine, and 20 units of the quail's cage "battery" type. The investigation used a block randomized design (BRD) with four treatments and five groups, each with a different level of palm and kepayang oil. If the treatment has a significant effect, the Duncan multiple test should be performed. We discovered that replacing palm oil in quail diets with kepayang oil reduced feed intake but had no significant effect on quail weight gain (P > 0.05). Furthermore, incorporating 3% kepayang oil into the quail diet had no effect on the feed efficiency ratio or day of first laying (P > 0.05). As a consequence, between the ages of 21 and 49 days, palm oil can be replaced with kepayang oil up to 3% of the total ration with no negative effects on feed intake, body weight gain, feed efficiency, or the age of the first egg laid. Keywords: Palm Oil, Kepayang Oil, Quails and Growth

Application of Starter Solution Increased Yields of Chili Pepper (Capsicum Annuum L.)

Chili pepper (Capsicum annuum L.) was grown with polyethylene mulched on Inceptisol soil with low pH (5.5), low organic-C (1.54%), very low total N (0.12%), low K content (0.29 me (100 g)-1), but very high soil P2O5 concentration (19.2 ppm) to evaluate the best crop management practices with starter solution. Seven starter solution combinations (1 = No Starter Solution + No CM + No SI, 2 = CM + SSVC, 3 = CM + SSG, 4 = SI + SSVC, 5 = SI + SSG, 6 = SI + CM+ SSVC, and 7 = SI + CM + SSG) were arranged in a randomized completely block design with four replications. Whereas CM = cow manure, SSVC = organic starter solution, SSG = inorganic starter solution, and SI=standard inorganic fertilizer. The results showed that inorganic, as well as organic, starter solution increased chili pepper growth and yield in less fertile soil. The highest marketable yield was obtained with application of standard inorganic (SI) + cow manure (CM) + inorganic starter solution (SSG). Inorganic starter solution application resulted in a better plant growth than organic starter solution, being evident at 1 week until 7 weeks after transplanting. However, inorganic starter solution did not signifi cantly increase total marketable yields. Application of cow manure, standard inorganic fertilizer, or addition of organic starter solution reduced total unmarketable yield, improved fruit qualities and increased marketable yiel

Aktivitas Stimulansia Ekstrak Etanol Bunga Dan Daun Cengkeh (Syzygium Aromaticum (L) Merr. & Perry.) Pada Mencit Jantan Galur Swiss Beserta Identifikasi Golongan Senyawa Aktifnya

Keywords : Cloves' buds and leaves (Syzygium aromaticum (L) Merr. & Perry.) ethanol extracts, stimulant, locomotoric activity, hole-board, open field, terpenoid, alkaloids One of the clove properties is as a stimulant. The purposes of this experimental study were to investigate stimulant effect of clove's buds and leaves ethanol extracts through locomotoric activity studies on male Swiss strain mice and to identify its active compounds. The experiment was performed with pretest and posttest control group design. Thirty two mice ware divided into eight treatment groups. Locomotoric activity study was performed with hole-board and open-field method. Mice in group I (negative control) provide orally CMC-Na 1% 25 mL/kg BW. Mice in group II (caffeine group) provided orally caffeine 25 mg/kg BW. Six other treatment groups provide clove's buds and leaves ethanol extracts (100, 200, and 400) mg/kg BW respectively. Frequency of mice head-deeping into holes in the floor and duration of movement in 5 minutes were accessed before and after treatment with extract. Data analyzed using paired-sample T test (p: 0.95). The result showed clove's buds and leaves ethanol extracts to have stimulant properties on male Swiss strain mice through enhancing locomotoric activity in hole-board method (p0.05). Terpenoid and alkaloid active compounds in clove's buds and leaves ethanol extracts though to play an important role in enhancing male Swiss strain mice locomotoric activities