Research & Reviews: International Journals

Melatonin: Another Phytohormone

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Since melatonin (N-acetyl-5-methoxytryptamine) had been discovered in phototrophic organisms, first in a dinoflagellate and later in plants, this compound has been detected in numerous algae and plant species.

Melatonin
Melatonin

Notably, the concentrations measured in plants were highly divergent, frequently in the nanomolar range, sometimes at the borderline of detection, but in other cases, above 20 or even 30 μg/g. Even levels in the range of 200 μg/g have been reported to be present in kernels of some Iranian Pistacia vera cultivars. Early research in this field had focused on two aspects, the presence of high melatonin levels in medicinal plants, and the possibility of functions similar to those known from vertebrate animals, especially the transmission of the signal ‘darkness’ in photoperiodic responses. Read More>>>>>>

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Complexity in the Stochastic Kaldor-Kalecki Model of Business Cycle with Noise

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Kaldor proposed a ordinary differential system to model business cycle, in which the gross investment depends on the level of output and capital stock. Thereafter, this model was often discussed, see and references there in. The Kalecki business model was a few years earlier than the Kaldor one.

Stochastic Kaldor-Kalecki Model
Stochastic Kaldor-Kalecki Model

Kalecki assumed that the saved part of profit is invested and the capital growth is due to past investment decisions. There is a gestation period or a time lag, after which capital equipment is available for production. In 1999, Krawiec and Szydlowski have formulated the Kaldor-Kalecki business cycle model based on the multiplier dynamics which is the core of both the Kaldor (after Keynes) and Kalecki approach. Read More>>>>>>>>>>

Mesokinetics of Formation and Growth of Nanostructured Substances with Strong Bonds

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Multiple scientific works are devoted to elaboration of methods for making nanostructured substances as well as for investigating a behavior of synthesized samples at different conditions. The study of formation, growth and behavior of nanostructures is a constituent part of mesophysics as the science dealing with the substance, revealing classical and quantum features simultaneously in the field of spatial scale 10–9–10–7 m.

Nanostructured objects
Nanostructured objects

Quantum features of a substance are most conspicuous with the availability of strong bonds between atoms. We consider two types of objects: 1) crystals whose lattice is formed by atoms of the same type oscillating as harmonic oscillators with typical frequencies ~1012–1014 s–1 (“atomic crystals”), and 2) crystals generated by macromolecules exhibiting both oscillating nature of internal motions with the given frequencies and rotary isomerism with the frequencies ~1010–1011 s–1 (“molecular crystals”). Read More>>>>>>>>>>

Biological Synthesis of Silver Nanoparticles

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Nanotechnology as an art and science of manipulating matter at atomic and molecular scale promises to provide a significant improvement in technologies for protecting our environment. It is an interdisciplinary branch emerging rapidly during recent years as a cutting edge technology in the new world. Use of nonomaterial in  biotechnology unites the fields of biology and material science.

Silver nanoparticles
Silver nanoparticles

Nanoparticles are considered to be very useful due to their exclusive properties that arise from a variety of aspects, including the similar size of nanoparticles and biomolecules. The nanoparticles can be synthesized by bottom up approach using physical, chemical as well as biological methods. The physical and chemical methods are extremely costly and may involve release of certain toxic material in nature. Read More>>>>>>>

From Dumpsites to Industries

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Dumpsites contain a range of different natural and manmade substances. Their degradation is usually carried out by hydrolytic enzymes secreted by the microbial population growing in it. Scientists have been working on isolating such enzymes for industrial applications.

Bacillus pantothenticus
Bacillus pantothenticus

Recent studies showed that industrially applicable cellulases can be isolated from such dumpsites with the help of partial purification and can later be purified through downstream processing methods. Doing so can provide commercial advantages that may be exploited for the benefit of mankind. Read More>>>>>>>>>>>

Application of Textiles in Medical Treatment Practices

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Textile engineering has made an unprecedented progress, especially in the past few decades.

Prototypes of textile pneumatic muscles of Politecnico di Torino
Prototypes of textile pneumatic muscles of Politecnico di Torino

Evidently, it has been implicated in the development of textile based prosthetic muscles that can help in restoring the structure and function of injured parts of the skeletal tissue. It is highly likely that such groundbreaking inventions will soon be implicated on clinical levels. Read More>>>>>>>>>>

Chemical Investigation for Antioxidant Property of Natural Extracts of Cinnamon, Black Pepper and Turmeric Using Singlet Oxygen

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Oxygen is an abundant element in nature with multiple faces. Dioxygen (O2) is the most common and important one, which is a prerequisite for all aerobic cell metabolism. Oxygen is also present in its another form with an unpaired electron; a free radical derivative with its highly unstable and reactive states.

Cinnamon & Black Pepper
Cinnamon & Black Pepper

These reactive forms have been implicated in a wide range of toxic mechanism in biological organisms. When the ground state O2 is exited to a higher energy state, singlet O2 is formed. This form of oxygen is also a harmful species for biological systems. Singlet oxygen can be formed photochemically by energy transfer from an excited photosensitizer. Numerous studies have focused on the use of antioxidants and scavenger enzyme systems.  Read More>>>>>>