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Fulltext Computational investigations on heat transfer enhancement using nanorefrigerants

Che Sidik, N. A., Adnan Alawi, O.

Journal of Advanced Research Design, 2014;1(1):35-41.
MyJurnal

Nanofluid has become one of the interesting topics for engineers working for decades to
develop more efficient heat transfer in different applications. Nanorefrigerant, as a combination of
nanoparticles and refrigerant, is a new concept that has been recently investigated by number of
researchers. Electricity consumption usually varies from one sector to another. Generally, residential
sector is one of the biggest electricity consumers in Malaysia. Based on the literature, 26.3% of
electricity consumption in the residential sector in Malaysia is allocated to refrigerator–freezers.
Fulltext Numerical study of harvesting solar energy from small-scale asphalt solar collector

Che Sidik, N. A., Hashim, G. A.

Journal of Advanced Research Design, 2016;2(1):10-19.
MyJurnal

This paper studied the heat transfer in an asphalt solar collector with small scale geometry.
Solar energy reaches the earth and consequently increases the temperature of the ground, which then
leads to the increase of the temperature of the air. Water circulates through a series of pipes embedded
in the asphalt pavement for the extraction of solar energy. The radiation in this study was produced
from the top asphalt pavement. In this study, the temperature of the asphalt pavement decreased when
solar energy was collected from the circulating water. This reduces the heat island effect in the city and
decreases the power consumption for air conditioning. The temperature is distributed between the
asphalt pavement and the inner pipes. Increase of the flow rate has a great influence on the energy
collection by reducing the temperature of the asphalt pavement. The result of this test was obtained
using a small-scale asphalt pavement, which showed a high amount of heat collected.
The investigation of the skin biophysical measurements focusing on daily activities, skin care habits, and gender differences

Hadi H, Awadh AI, Hanif NM, Md Sidik NF, Mohd Rani MR, Suhaimi MS

Skin Res Technol, 2016 May;22(2):247-54.
PMID: 26333416 DOI: 10.1111/srt.12257

Skin, as a protective barrier to exogenous substances, can be modulated by various internal and external factors that can affect its functional state. In order to prevent the early symptoms and signs of diseases of the skin, frequent skin health assessment should be performed. The aims of the study were to evaluate four skin properties of transepidermal water loss (TEWL), hydration, elasticity, and pigmentation using a non-invasive skin assessment tool, DermaLab Combo(®) , and also to determine possible factors that may influence skin condition.
Fulltext Isolation, Purification, and Characterization of Five Active Diketopiperazine Derivatives from Endophytic Streptomyces SUK 25 with Antimicrobial and Cytotoxic Activities

Alshaibani M, Zin NM, Jalil J, Sidik N, Ahmad SJ, Kamal N, et al.

J Microbiol Biotechnol, 2017 07 28;27(7):1249-1256.
PMID: 28535606 DOI: 10.4014/jmb.1608.08032

In our search for new sources of bioactive secondary metabolites from Streptomyces sp., the ethyl acetate extracts from endophytic Streptomyces SUK 25 afforded five active diketopiperazine (DKP) compounds. The aim of this study was to characterize the bioactive compounds isolated from endophytic Streptomyces SUK 25 and evaluate their bioactivity against multiple drug resistance (MDR) bacteria such as Enterococcus raffinosus, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumanii, Pseudomonas aeruginosa, and Enterobacter spp., and their cytotoxic activities against the human hepatoma (HepaRG) cell line. The production of secondary metabolites by this strain was optimized through Thornton's medium. Isolation, purification, and identification of the bioactive compounds were carried out using high-performance liquid chromatography, high-resolution mass liquid chromatography-mass spectrometry, Fourier transform infrared spectroscopy, and nuclear magnetic resonance, and cryopreserved HepaRG cells were selected to test the cytotoxicity. The results showed that endophytic Streptomyces SUK 25 produces four active DKP compounds and an acetamide derivative, which were elucidated as cyclo-(L-Val-L-Pro), cyclo-(L-Leu-L-Pro), cyclo-(L-Phe-L-Pro), cyclo-(L-Val-L-Phe), and N-(7-hydroxy-6-methyl-octyl)-acetamide. These active compounds exhibited activity against methicillin-resistant S. aureus ATCC 43300 and Enterococcus raffinosus, with low toxicity against human hepatoma HepaRG cells. Endophytic Streptomyces SUK 25 has the ability to produce DKP derivatives biologically active against some MDR bacteria with relatively low toxicity against HepaRG cells line.
Fulltext Induction of hairy roots by various strains of Agrobacterium rhizogenes in different types of Capsicum species explants

Md Setamam N, Jaafar Sidik N, Abdul Rahman Z, Che Mohd Zain CR

BMC Res Notes, 2014 Jun 30;7:414.
PMID: 24981787 DOI: 10.1186/1756-0500-7-414

BACKGROUND: Capsicum annuum and Capsicum frutescens, also known as "chilies", belong to the Solanaceae family and have tremendous beneficial properties. The application of hairy root culture may become an alternative method for future development of these species by adding value, such as by increasing secondary metabolites and improving genetic and biochemical stability compared with normal Capsicum plants. Therefore, in this research, different types of explants of both species were infected with various Agrobacterium rhizogenes strains to provide more information about the morphology and induction efficiency of hairy roots. After 2 weeks of in vitro seed germination, young seedling explants were cut into three segments; the cotyledon, hypocotyl, and radical. Then, the explants were co-cultured with four isolated A. rhizogenes strains in Murashige & Skoog culture media (MS) containing decreasing carbenicillin disodium concentrations for one month.
RESULTS: In this experiment, thick and short hairy roots were induced at all induction sites of C. annuum while thin, elongated hairy roots appeared mostly at wound sites of C. frutescens. Overall, the hairy root induction percentages of C. frutescens were higher compared with C. annuum. Hairy root initiation was observed earliest using radicles (1st week), followed by cotyledons (2nd week), and hypocotyls (3rd week). Cotyledon explants of both species had the highest induction frequency with all strains compared with the other explants types. Strains ATCC 13333 and ATCC 15834 were the most favourable for C. frutescens while ATCC 43056 and ATCC 43057 were the most favourable for C. annuum. The interactions between the different explants and strains showed significant differences with p-values < 0.0001 in both Capsicum species.
CONCLUSIONS: Both Capsicum species were amenable to A. rhizogenes infection and hairy root induction is recommended for use as an alternative explants in future plant-based studies.