Abstract. Surface plasmon resonance (SPR) can only be achieved if sufficient energy is provided at the boundary between metal and dielectric. An employment of prism as a light coupler by using Kretschmann configuration is one of the alternative for the production of adequate energy to be generated as surface plasmon polaritons (SPP). This work is carried out to investigate the effect of physical structure of the prism and its refractive index to the excitation of SPPs. A 50nm gold thin metal film with dielectric constant of ε=-12.45i+1.3 was deposited on the hypotenuse surface of the prisms. The physical structures of the prisms were varied such as triangular, conical, hemispherical and half cylindrical. These prisms were classified into two types of refractive indices (RI), namely n=1.51(type BK7) and n=1.77(type SF11). Based on SPR curve analyses, we discovered that strong SPR signals which consist of 82.98% photons were excited as SPPs can be obtained by using type-BK7 prism with physical structures of hemispherical or half cylindrical. From the view of selectivity ability as sensors, the usage of type-SF11 prisms (half cylindrical and hemispherical) able to enhance this impressive feature in which sharp SPR curves with small FWHM values were obtained. In conclusion, apart from properties of thin film materials, the physical structure of prisms and their RI values play crucial roles to obtain optimum SPR signal. High sensitivity SPR sensor can be established with the appointment of type-BK7 prisms (hemispherical or half cylindrical shape) as light couplers.

Autism spectrum disorder (ASD) is a neurological disorder triggered by various factors through complex mechanisms. Research has been done to elucidate the potential etiologic mechanisms in ASD, but no single cause has been confirmed. The involvement of oxidative stress is correlated with ASD and possibly affects mitochondrial function. This study aimed to elucidate the link between mitochondrial dysregulation and idiopathic ASD by focusing on mitochondrial respiratory capacity and membrane potential. Our findings showed that mitochondrial function in the energy metabolism pathway was significantly dysregulated in a lymphoblastoid cell line (LCL) derived from an autistic child (ALCL). Respiratory capacities of oxidative phosphorylation (OXPHOS), electron transfer of the Complex I and Complex II linked pathways, membrane potential, and Complex IV activity of the ALCL were analyzed and compared with control cell lines derived from a developmentally normal non-autistic sibling (NALCL). All experiments were performed using high-resolution respirometry. Respiratory capacities of OXPHOS, electron transfer of the Complex I- and Complex II-linked pathways, and Complex IV activity of the ALCL were significantly higher compared to healthy controls. Mitochondrial membrane potential was also significantly higher, measured in the Complex II-linked pathway during LEAK respiration and OXPHOS. These results indicate the abnormalities in mitochondrial respiratory control linking mitochondrial function with autism. Correlating mitochondrial dysfunction and autism is important for a better understanding of ASD pathogenesis in order to produce effective interventions.

The high diversity of native Philippine murid rodents includes an old endemic group, the chrotomyines, which are the sister group of the Australasian hydromyines. Herein we detail their interspecific diversity of relative testes mass (RTM) and sperm morphology. We find that in chrotomyines, as in the Australasian hydromyines, testes mass relative to body mass differs by an order of magnitude across the species and ranges from a large RTM in Soricomys and Chrotomys species to a small RTM in Apomys. Sperm morphology is associated with these findings, with individuals in species of Soricomys and Chrotomys producing relatively larger spermatozoa with a prominent apical hook and long tail, whereas, by contrast, the Apomys species have a sperm head that either has a very short or no apical hook and a shorter tail. These findings indicate coevolution of RTM with sperm morphological traits across the species, with the marked interspecific differences in RTM suggesting differences in the intensity of intermale sperm competition and hence breeding system. Thus, we hypothesise that species of Soricomys and Chrotomys that produce more streamlined spermatozoa with longer tails have a polyandrous or promiscuous mating system, whereas the Apomys species, which produce smaller and less streamlined spermatozoa, may exhibit monogamy.

Introduction: Honey is one of the oldest traditional medicines. It has been well known that honey contains various components that could be use as treatment option. Most commonly studied honeys include gelam, kelulut, acacia, tualang and pineapple honeys. This review listed the five most commonly studied honeys, its properties and the study model involved.Results: Honey has been reported to have multiple properties. Honeys were used to study their antimicrobial properties which includes antibacterial and antifungal, anti-inflammatory, antioxidant, anti-ulcer and wound healing, anticancer properties. Interestingly, tualang honey was used to study cognitive function and also used to study its ability to function as an adjuvant. Gelam honey and tualang honey both have been studied to determine their effects on fertility. From these five honeys reviewed, the most studied honey is tualang honey that showed significant impact not only on general health being and wound healoing, but also on cancer, inflammation, infection, oxidative stress, cognitive function as well as potential adjuvant. The studies were carried out on different study model from cell lines (in vitro) animal such as Sprague-dawley rats and Wistar albino rats and also human. Conclusion:Honey is a natural compound with significant impact on health and general well-being. These effects might be due to its phenolics and flavonoid content as well as its involvement as signalling molecule that initiates the possible mechanism that needs to be further clarified in the future in treating and preventing diseases.

Oxidative damage induced by free radicals are the attendant causes of many chronic diseases. The purpose of this study was to investigate whether Lespedeza cuneata water extract (LCW) has antioxidant and anti-diabetic activities in vitro. Anti-oxidant activity was measured by superoxide anion (O 2 -), hydroxyl (·OH) radical, nitric oxide (NO) and peroxynitrite (ONOO -) scavenging assays. Further, radicalmediated protein oxidation was measured by an allophycocyanin assay. Alpha-glucosidase, dipeptidyl peptidase (DPP)-IV and anti-glycation assays were conducted to measure its anti-diabetic activities. LCW significantly inhibited O 2 -, ·OH and ONOO -formation. LCW strongly protected radical-induced allophycocyanin degradation during 60 min from the initiation of the reaction. LCW significantly inhibited α-glucosidase, DPP-IV and advanced glycation end product formation. Our results suggest that LCW had both anti-oxidant and anti-diabetic activities, and could be used for the prevention and treatment of oxidative stress and diabetes.