To improve the heat dissipation of high-power light-emitting diodes (LEDs), a cooling system with a fan is proposed. In the experiment, the LEDs array of 18 W composed of 6 LEDs of 3 W is used and the room temperature is 26oC. Results show that the temperature of the substrate of LEDs reaches 62oC without the fan, however, it reaches only 32oC when the best cooling condition appears. The temper...

in the present study, hydrilla verticillata biomass was investigated as a novel biosorbent for the uptake of basic dye malachite green from its aqueous solution. kinetic and equilibrium studies were carried out in batch process. batch adsorption experiments were conducted to study the effect of ph, temperature, sorbent dosage, initial dye concentration, and contact time for the removal malachit...

Reducing the Incidence of Ascites in Broiler Flocks Ensure adequate ventilation from placement to depletion. 1. Ventilation rates should be linked to house biomass, supplying enough air to replenish the oxygen consumed and ensure the adequate removal of waste gases. Providing sufficient oxygen is vital at high altitudes. Oxygen is a constant percentage of air, but at low atmospheric pressures a...

Global warming, as well as europhication are predicted to promote cyanobacterial blooms, but how tropical phytoplankton communities from different trophic state systems respond to temperature variation is less known. To further explore the effect of temperature changes and nutrient addition on phytoplankton communities and to get insight in possible resistance to these effects, we tested the hy...

This study evaluates the potential of Arthrobacter nicotiniae to preferentially remove lead, cadmium, silver and zinc from contaminated soil Amaonye-ishiagu Agricultural Forest, Ebonyi State, Nigeria using standard methods. The revealed optimum values factor as 8ml nutrient volume, 5g organism, 30oC temperature, pH 8 stirring frequency 4pw. showed 79.78% removal 61.50% 48.59% arsenic 7.04% on 3...

Penelitian ini bertujuan untuk melihat hubungan kondisi udara masuk terhadap keluaran air cooler. Selain itu juga mendapatkan nilai efektivitas rata Suhu divariasikan, tetapi memiliki kelembapan spesifik w yang sama. Proses penurunan suhu udara, terjadi pada saat melewati beberapa cooling pad permukaannya dialiri air. pendinginan diasumsikan berjalan secara evaporative cooling. dilakukan eksper...

Recently, xylanases have expanded their use in many processing industries, such as pulp and paper, food and textile. The production of xylanase by the fungus Penicillium sclerotiorum under submerse cultivation was investigated. Oat spelts xylan and wheat bran were the best inducers of xylanase activity. Optimal xylanase production was obtained in liquid Vogel medium, pH 6.5, at 30oC, under stat...

Keratinolytic abilities of Bacillus polymyxa B20 and B. cereus B5esz were evaluated in liquid cultures in mineral media containing chicken feathers. Both tested strains were capable of effective liquefying and biodegradation of feather keratin, up to 56.5 – 72.1% in ten-day cultures, releasing considerable amounts of hydrolysis products. Tested bacteria were mesophilic species, producing highes...

In the present study a simple, accurate & precise reverse phase liquid chromatographic method has been developed & validated for simultaneous estimation of Atenolol & Indapamide from tablet dosage form. The method was developed using Waters HPLC system on a L1 column (Hypersil Gold: 250mm x 4.6 mm, 5μm) using a mixture of 0.1% Triethyl Amine in water of pH 3.0 & Methanol in the ratio 30:70 v/v ...

Haematologica vol. 84(11):November 1999 nation of blood products. In this case, the transmission of a strain of P. rettgeri originated from the same donor, resulted in the death of two patients. Although Gram negative bacilli have been described as contaminants of blood products, we have not found any references concerning P. rettgeri.2,3 In the present case, the donor could not be studied, but...