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The structures of these compounds were elucidated by spectroscopic analysis (LC-MS, FTIR and NMR) as 15a-hydroxyandrost-4-en-3,17-dione (15α-OH-AD; 2) and 11a,15a-dihydroxyandrost- 4-en-3,17-dione (11a,15a-diOH-AD; 3).
Microbial transformations of steroids provide an important method of obtaining synthetic intermediates and novel steroid derivatives of potential pharmaceutical activity due to its high chemo-, regio- and stereoselectivity, which additionally fulfills green chemistry principles and meets demands of “ white biotechnology ” [6-10].
Structure elucidation was accomplished by FTIR, ESI-MS and NMR techniques.
Definitive confirmation of the structure of compound 2 was given by comparison with NMR data previously reported for 15α-hydroxyandrost-4-en-3,17-dione [15].

The FTIR results showed a more detailed structure of α-chitin in the region of O-H, N-H and CO stretching region.
The peaks observed were in good match with the reported literature, which conforms the chitosan structure.
The FTIR results indicated that the spectra showed a more detailed structure of α-chitin in the region of O-H, N-H and CO stretching region.
Aiba, Chemistry Modified Chitin and Chitosan as Biomaterials, Progress in Polymer Science. 29 (2004) 887–908

China 3Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P.
The structure and properties of thin film catalysts were characterized by X-ray diffraction (XRD), SEM and AFM.
It is clearly observed that all of the diffraction peaks can be well-indexed to (002), (110), (103) and (112) phases, corresponding to a hexagonal structure for CdS (JCPDS, No. 77-2306).
Acknowledgements This study was supported by the Natural Science Foundation of China(21063005 and50968005), the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry(20091341), the Natural Science Foundation of Guangxi Province (2010GXNSFC013007) and the Foundation of State Key Laboratory of Structural Chemistry(20100017).

The article presents the operation and structure of a dispersion adhesive applicator dedicated for printing industry.
Structure of the Device Based on the mathematical model, a 3D model was designed.
Structure of the control system The user panel displays messages with errors in the case of a low level of glue or a too low/too high temperature (when the glue container heater is switched on).
Free control over the length of the area to be covered in glue enables the manufacture of the documents of different geometry without the need to introduce changes in the structure of the device.
Henriksson, Pulp and Paper Chemistry and Technology: Paper Products Physics and Technology, Walter de Gruyter, 2009.

Crystal structures of these compounds may be considered as totality of metal and boron sublattices.
Detail information on LuBn (n=2, 4, 12) crystal structures is presented in (Table 1), the crystal structures in Fig. 1 was sketched out graphically with the Autodesk® 3ds Max® 2008 software [2].
The tetragonal LuB4 crystal structure (ThВ4-type) may be presented as a combination of hexagonal AlB2 and cubic СаВ6 type structures [4] (Fig. 1,b).
[3] Gmelin Handbook of Inorganic Chemistry.
Structure study of some RE dodecaborides and high-boron compounds.

The filler has a significant impact on the structure of polyurethane foam.
The increase in the filled polyurethane foams samples strength by 3 ... 4 times is explained by a less defective structure.
This factor is especially relevant when using polyurethane foam for insulation of roofs of buildings and structures.
The cellular structure of the insulation is broken, the number of open cells increases, and air evaporates from them.
Davis, Foundations of Organic Chemistry, The great courses, 2014 [2] A.A.

Effect of Anatase/Rutile Phase Ratio on the Photodegradation of Methylene Blue under UV Irradiation Yi Yi ZAW1,2,a, Duangdao CHANNEI3,b, Thotsaphon THRERUJIRAPAPONG4,c, Wilawan KHANITCHAIDECHA1,2,d, Auppatham NAKARUK2,5,e 1Department of Civil Engineering, Faculty of Engineering, Naresuan University, Phitsanulok 65000 Thailand 2Centre of Excellence for Innovation and Technology for Water Treatment, Faculty of Engineering, Naresuan University, Phitsanulok 65000 Thailand 3Department of Chemistry, Faculty of Science, Naresuan University, Phitsanulok 65000 Thailand 4Department of Materials and Production Technology Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800 Thailand 5Department of Industrial Engineering, Faculty of Engineering, Naresuan University, Phitsanulok 65000 Thailand ayiyizaw1985@gmail.com, bduangdaoc@nu.ac.th, cthotsaphon.t@eng.kmutnb.ac.th, dwilawank1@gmail.com, eauppathamn@nu.ac.th Corresponding author: Wilawan
In this work, the effect of calcination temperature on the structure, morphology and photocatalytic activity were investigated.
The phase composition ratio can influence the nanoparticles properties including band gap, specific surface area and energy band structure.
The phase composition can effect the nanoparticles properties including band gap, specific surface area and energy band structure.

The phase structure of different samples can be identified as single perovskite structure with no second phase detected.
The phase structures were examined by X-ray diffraction (XRD, D/MAX-2550V, Rigaku, Tokyo, Japan).
Varela, Structural effects of Li and K additives on the columbite precursor and 0.9PMN–0.1PT powders, Materials Chemistry and Physics. 84(1) (2004) 120-125

Furthermore, the dimensions and morphology were acquired by utilizing TEM images, as the samples' crystal structure was conducted by an HR-TEM. 2.1.5.
Digital Microscope The glass samples were examined further to understand the mineralogical structure and damage mechanisms.
Additionally, HRTEM analysis revealed a strong alignment between AuNPs and the crystalline plane of the face-centered cubic (FCC) structure of gold.
El-Sayed, Chemistry and Properties of Nanocrystals of Different Shapes, Chem.
Kreislova, Artificial weathering of model glasses with medieval compositions-an empirical study on the influence of particulates, Physics and Chemistry of Glasses, Eur.

Tribology is then at the crossroad of mechanics, physics and chemistry.
This step allows friction tests to be performed with respect to the physics and chemistry of the studied forming process.
We developed a sequential fluid-structure weak coupling approach in order to compute the deformation of 2D asperities in mixed lubrication regime and predict the final roughness of a deformed strip.
Principle of the a sequential fluid-structure weak coupling approach from [16] Fig. 12. a) Simplified roughness geometry, b) Comparison between the real profile (in blue) and the modeled profile (in red) Fig. 13.
Surface analyses performed on new and used tools exhibit that the structures of the PVD and CVD surfaces are different and lead to different wear patterns.