In vitro antiproliferative and antioxidant activities of the extracts of Muntingia calabura leaves.

The in vitro antiproliferative and antioxidant activities of the aqueous, chloroform and methanol extracts of Muntingia calabura leaves were determined in the present study. Assessed using the 3,(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide) (MTT) assay, the aqueous and methanol extracts of M. calabura inhibited the proliferation of MCF-7, HeLa, HT-29, HL-60 and K-562 cancer cells while the chloroform extract only inhibited the proliferation of MCF-7, HeLa, HL-60 and K-562 cancer cells. Interestingly, all extracts of M. calabura, which failed to inhibit the MDA-MB-231 cells proliferation, did not inhibit the proliferation of 3T3 (normal) cells, indicating its safety. All extracts (20, 100 and 500 μg/ml) were found to possess antioxidant activity when tested using the DPPH radical scavenging and superoxide scavenging assays with the methanol, followed by the aqueous and chloroform, extract exhibiting the highest antioxidant activity in both assays. The total phenolic content for the aqueous, methanol and chloroform extracts were 2970.4 ± 6.6, 1279.9 ± 6.1 and 2978.1 ± 4.3 mg/100 g gallic acid, respectively. In conclusion, the M. calabura leaves possess potential antiproliferative and antioxidant activities that could be attributed to its high content of phenolic compounds, and thus, needs to be further explored

Model Dan Teknik Kalibrasi Citra Untuk Sistem Autonomous Robot

Kalibrasi kamera dan pengolahan citra adalah faktor yang paling penting dalam computer vision. Beberapa teknik yang diterapkan dalam proses kalibrasi diantaranya adalah teknik linier, teknik non linier dan teknik dengan dua tahap. Teknik-teknik kalibrasi tersebut dapat dimanfaatkan untuk implementasi autonomous robotic khususnya dalam robotic soccer. Proses kalibrasi menjadikan faktor penentu keberhasilan dalam permainan robotic soccer. Saat ini tim yang berhasil melakukan kalibrasi kamera dengan baik adalah tim yang akanmampu memenangkan pertandingan

Zingiber zerumbet (L.) Smith: A Review of Its Ethnomedicinal, Chemical, and Pharmacological Uses

Zingiber zerumbet Sm., locally known to the Malay as “Lempoyang,” is a perennial herb found in many tropical countries, including Malaysia. The rhizomes of Z. zerumbet, particularly, have been regularly used as food flavouring and appetizer in various Malays' cuisines while the rhizomes extracts have been used in Malay traditional medicine to treat various types of ailments (e.g., inflammatory- and pain-mediated diseases, worm infestation and diarrhea). Research carried out using different in vitro and in vivo assays of biological evaluation support most of these claims. The active pharmacological component of Z. zerumbet rhizomes most widely studied is zerumbone. This paper presents the botany, traditional uses, chemistry, and pharmacology of this medicinal plant

Optical characterization on ITO/TiO2/P3HT/Areca Catechu/au for thin film hybrid solar cell

In this research, dye sensitized solar cell is fabricated by a combination of inorganic titanium dioxide nanoparticles sensitized by a locally available natural dye extract from organic Areca Catechu nut. This hybrid solar cells are fabricated accordingly by deposition of ITO/TiO2/P3HT/Areca Catechu/Au by using electrochemical method. The deposition rates of TiO2 are varied from 0.05, 0.07, 0.09 to 0.11 vs-1 whereas the number of scan of each layers are fixed to 5. The absorption spectra analysis is carried out in the wavelength range 200 to 600 nm, showed a wide and significant absorption spectrum in UV and visible regions. Analysis shows that scan rate affects the electrical conductivity of hybrid solar cell. The highest conductivity is recorded at 0.278 Scm-1 corresponding to the scan rate of 0.07 Vs-1at a potential value of 3.5 V

Physical Performance and Cross Layer Design for Wireless Mesh Networks

Wireless mesh networks (WMNs) are an alternative technology for last-mile broadband Internet access that can support broadband services. However, for a WMN to be all it can be, considerable research efforts are still needed. In WMNs, the Orthogonal Frequency Division Multiplexing (OFDM) system is chose to provide the better performance at the physical layer design. OFDM is very tolerant to ISI and it's spectrally efficient. OFDM also very susceptible to phase and frequency offsets. This paper presents the physical layer design of an OFDM system for wireless mesh networkin

Creating a culture of prevention in occupational safety and health practice: perceived body discomfort in two sitting positions

Prolonged sitting is one of the factors for back discomfort. Sitting in the same position for long periods of time is worse. This experimental based study was conducted to achieve three objectives. There were to 1) identify whether is there any differences between perceived body discomfort among respondents before and after upright sitting, 2) identify whether is there any differences between perceived body discomfort among respondents before and after slump sitting and 3) compare the level of perceived body discomfort among respondents after two sitting postures. Thirty young and healthy adults were recruited as study respondents. Each respondent was asked to sit in a posture either upright or slump for 30 minutes. Respondents were then rated their body discomfort using Borg CR-10 scale before and after sitting. Another sitting posture was carried out after one day interval. There is a significant difference between perceived body discomfort among respondents before and after upright and slump sitting. Body discomfort of upright sitting was shown significantly greater than slump sitting. Although, slump sitting caused less discomfort than upright, but it proven by previous studies did not provide benefit to occupational safety and health practice in preventing occupational health related disease

Local community perceptions on sea turtle egg consumption in Redang Island, Malaysia

info:eu-repo/semantics/publishe

Perancangan Strategi Penyerangan pada Robot Sepak Bola

Strategi menyerang atau bertahan merupakan dasar strategi dalam robot sepak bola. Keberhasilan suatu tim robot sepak bola dipengaruhi oleh keberhasilan pemain robot untuk memasukkan bola ke dalam gawang lawan. Strategi menyerangan merupakan faktor utama penentu keberhasilan tim robot sepak bola untuk memenangkan setiap pertandingan. Dalam penelitian ini kami akan membuat perancangan strategi penyerangan yang dipergunakan dan diimplementasikan dalam keadaan yang sesungguhnya. Perancangan strategi tersebut membagikan kawasan lapangan menjadi beberapa kawasan kecil dan 2 kawasan utama, dimana setiap kawasan tersebut akan memberikan aksi yang berbeda. Untuk 2 (dua) kawasan utama serta menentukan strategi mana yang akan dipilih, baik melakukan penyerangan ataupun bertahan. Pada saat kondisi bertahan maka strategi penyerangan menjadi tidak aktif dan robot-robot akan menjaga kawasan pertahanan untuk menghindari masuknya bola ke dalam gawang. Kondisi yang lain akan berganti apabila bola berada pada kawasan lawan, strategi penyerangan menjadi aktif dan semua robot akan memposisikan untuk mendukung proses penyerangan kepihak lawan. Kondisi tersebut akan selalu berganti mengikuti posisi. Dalam penelitian ini menghasilkan suatu rancangan strategi penyerangan dalam bentuk diagram alir untuk memudahkan pemrogram starategi untuk mengimplementasikan kedalam keadaan yang sesungguhnya