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Showing 3 results for Stimulants
B. Daraei, E. Sahraei, E. Aghazadeh ,
Volume 10, Issue 4 (12-2019)
Abstract
The stimulants are materials that increase alertness and reduce physical and mental fatigue. These drugs increase the activity of excitatory receptors and reduce the activity of inhibitory receptors in the central nervous system. Methamphetamine, also known as crystal, is a psychoactive substance. This drug is stimulating nerves and by a direct effect on the brain, mechanisms cause joy and excitement in people. Methamphetamine in low to moderate doses (5 to 30 mg) causes euphoria; excitement, increased heart rate, and blood pressure, mydriasis, increased body temperature and decrease appetite. High but non-lethal doses of methamphetamine cause mental disorders and psychotic symptoms, seizures, and rhabdomyolysis. Cardiovascular toxicity of methamphetamine-induced hypertension, arrhythmia, acute coronary syndrome and ischemic ventricular. The most important cellular mechanisms involved in the damage caused by Methamphetamine are oxidative stress, excitotoxicity, and mitochondrial damage. The synthesis of methamphetamine in illegal workshops mainly of six methods which are based on the raw materials are divided into two groups. Raw materials in the synthesis of methamphetamine are ephedrine and phenyl propanol. In reduction, methods involve Birch reduction, Nagai and hydrogenation Rosenmund ephedrine and pseudoephedrine are used as raw material, in Lockhart methods and amination reduction methods based on phenyl propanol as raw material.
Volume 14, Issue 6 (11-2012)
Abstract
Volatile compounds generated from two types of polymeric laminated films, irradiated by gamma radiation at 8, 10 and 15 kGy, were investigated. Activated carbon was used as a dry food simulant to trace the migrating compounds by Gas Chromatography/Mass Spectroscopy (GC/MS). The resulting data showed that the Polyethylene Terephthalate (PET)/Polyethylene Terephthalate (PET)/Linear Low Density Polyethylene (LLDPE) film was more resistant to gamma radiation as compared to Biaxial Oriented Polypropylene (BOPP)/Cast Polypropylene (CPP) film. Toxic radiolysis products migrated through both laminated films at 8 and 15 kGy gamma irradiation. The toxic products originating from additives formulated in adhesive and in direct food contact layers may be considered as high risk against the safety of dry foodstuffs such as spices.
Volume 18, Issue 2 (3-2016)
Abstract
A fundamental shift to a total system approach for crop management in greenhouses is urgently needed to resolve escalating economic and environmental consequences of long-lasting undesired effects of synthetic pesticides used in combating agricultural pests. The aim of this study was to examine a potential new approach i.e. Microbial-based Production System (MPS) for greenhouse-grown peppers. For this purpose, a two-year experiment in greenhouse was carried out in southwestern Turkey (Antalya) in 2011 and 2012, and only microbial-based products were used to suppress and control invertebrate pests (insects, mites, nematodes, gastropods, etc.) and diseases. In addition, biostimulants, inoculants, and bioyield enhancers were used for plant growth, being supported with three macro elements (NPK: Nitrogen– Phosphorus–Potassium) that are considered to be essential elements for plant growth and development. A conventional plot, largely based on the use of synthetic chemical inputs, such as fertilizers and pesticides, was included as the control. The efficacy of the MPS was evaluated by monitoring the population development of the key arthropod pests, such as the cotton whitefly Bemisia tabaci (Gennadius) (Homoptera: Aleyrodidae), the western flower thrips Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) etc. and their natural enemies compared with that in a Conventional Production System (CPS). The results showed significantly lower numbers of the key pests, but higher numbers of natural enemies were seen in the MPS of greenhouse-grown peppers compared with the CPS throughout the study. Total yield was relatively higher in the CPS than the MPS in both experimental years.
