نتایج جستجو برای: 50 and 60oc
تعداد نتایج: 16882752 فیلتر نتایج به سال:
Aureobasidium pullulans is ubiquitous, polymorphic and black fungus producing a variety of important metabolites including enzymes, polysaccharides and single cell protein. It is considered as a probable source for antagonistic activity against a number of phytopathogenic fungi and possible biocontrol agent of post harvest diseases. The present work aims at the antibacterial compounds produced ...
until now many studies have been done over recent decades throughout the world to show the right age to start english. in iran, research is still at an early stage in terms of evaluating teachers’ beliefs about teaching children english. the problem of at what age to start teaching english and how to teach english to elementary school children has not been solved neither in this country nor els...
we have two part in this thesis, at first: the interaction of native calf thymus dna (ct-dna) with two anthraquinones including quinizarin (1,4- dihydroxy anthraquinone) and danthron (1,8- dihydroxy anthraquinone) in a mixture of 0.04 m brittone-robinson buffer and 50% of ethanol were studied at physiological ph by uv-vis absorption, florescence, circular dichroism spectroscopic methods, viscos...
in this thesis, a better reaction conditions for the synthesis of spirobarbiturates catalyzed by task-specific ionic liquid (2-hydroxy-n-(2-hydroxyethyl)-n,n-dimethylethanaminium formate), calcium hypochlorite ca(ocl)2 or n-bromosuccinimide (nbs) in the presence of water at room temperature by ultrasonic technique is provided. the design and synthesis of spirocycles is a challenging task becaus...
one of the most commonly used techniques to reduce the corrosion rate of rebar in concrete is addition substances named corrosion inhibitors into the concrete. corrosion inhibitor is chemical compounds that were added to concrete to prevent corrosion of steel in concrete. sodium nitrate is a type of anodic inhibitors that this study investigatesthe effect of this inhibitor on the properties of ...
The prevention of skin aging has been one of the main aims of cosmetic products. Propolis and tocopheryl acetate can be promising substances because of their antioxidant properties. In this study, propolis extract was obtained and associated with tocopheryl acetate in a cream formulation, which then underwent stability and sensory assessment. The formulation containing propolis extract and toco...
The search for alternative ingredients as natural sweeteners needs to be done. circulating in the market are synthetic with no nutritional value and harm health. This research aims produce a safe sweetener form of glucose syrup, which can used an artificial through enzymatic reactions, find out suitable reaction conditions syrup highest levels several combinations pH temperature. Mango seed cor...
The purpose of this study is to determine the effect of bromelain produced from pineapple crowns on the quality of beef round cuts. The beef was treated with bromelain at the following condition; the pH of beef was 5.6, the immersion temperature was 60oC, the concentration of bromelain solution was 0.17% and the immersion time was 10 minutes. Bromelain decreased the hardness, water holding capa...
Telah dilakukan studi penelitian yang bertujuan untuk membandingkan kondisi paling optimum penggunaan katalis K2O dan Li2O dalam pembuatan biodiesel berbasis minyak rapeseed. Penelitian meliputi sintesis katalis, karakterisasi proses reaksi transesterifikasi dengan pelarut methanol juga pengujian potensi kembali katalis. Beberapa parameter diuji ini adalah waktu reaksi, temperatur, rasio methan...
Sperm ligand on Escherichia coli that agglutinates human spermatozoa has been extracted from washed E. coli cells by incubating with 3M NaCl for 12 h at 37oC under shake conditions (150 rpm). Further the sperm ligand was purified after extensive dialysis against double distilled water by step down chromatography procedures (molecular weight sieving, anion exchange). The purification procedure y...
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