P eople are increasingly dependent upon technology. However, companies' large-scale investments to establish ongoing loyalty to technology platforms and ecosystems show negative results. This is due to lower levels of trust, concerns about risks, and increasing issues of privacy. Despite the continuous development of digital assistant applications to increase interactivity, however, there is no guarantee that the concept of interactivity is capable of gaining users' trust and addressing their concerns. The purpose of the present study is to analyze the effects of controllability, synchronicity, bidirectionality on perceived performance, and user satisfaction with digital assistant applications as moderated by perceived trust. Amos 22.

Naskah diterima tanggal 23 April 2014 dan disetujui untuk diterbitkan tanggal 31 Oktober 2014 ABSTRAK. Rambutan merupakan tanaman menyerbuk silang sehingga secara alami memiliki keragaman tinggi. Penelitian bertujuan mempelajari kemiripan genetik dan pengelompokan aksesi plasma nutfah rambutan (Nephelium lappaceum) dan kapulasan (Nephelium ramboutan-ake) di Indonesia berdasarkan karakteristik morfologi. Penelitian dilakukan di (1) Kebun Percobaan (KP) Aripan Balai Penelitian Tanaman Buah Tropika, (2) KP Subang Balai Penelitian Tanaman Buah Tropika, (3) KP Cipaku Balai Pengkajian Teknologi Pertanian Jawa Barat, dan (4) Kabupaten Limapuluh Kota (Sumatera Barat), pada bulan Juni 2013 sampai Februari 2014. Karakterisasi sifat morfologi dilakukan terhadap 29 aksesi rambutan dan empat aksesi kapulasan mengacu pada descriptor for rambutan yang diterbitkan IPGRI. Perhitungan koefisien ketidakmiripan antaraksesi dilakukan dengan metode Gower. Analisis nominal logistic biplot dilakukan untuk melihat sifat penciri dari suatu kumpulan aksesi. Analisis keragaman genetik dapat membedakan kelompok rambutan dan kapulasan dengan koefisien ketidakmiripan rerata sekitar 55%. Berdasarkan kerapatan tandan, rambutan dapat dikelompokkan menjadi lima kelompok, yaitu aksesi yang memiliki tandan sangat jarang, jarang, sedang, rapat, dan sangat rapat. Aksesi dengan tandan rapat sampai sangat rapat antara lain aksesi Gendut Kair, Tangkue, dan Aceh Gendut, sedangkan semua aksesi kapulasan memiliki tandan yang sangat jarang. Berdasarkan ketebalan kulit buah, semua aksesi rambutan memiliki ketebalan kulit sedang sampai tebal, sedangkan aksesi Sibabat diketahui memiliki kulit yang sangat tebal. Katakunci : Nephelium lappaceum; Keragaman genetik; Karakteristik morfologiABSTRACT. Rambutan is a cross-pollinated crop which naturally has high genetic diversity. The study aimed to elucidate genetic distances and develop putative clusters among rambutan (Nephelium lappaceum) and kapulasan (Nephelium ramboutan-ake) germplasm in Indonesia. The study was conducted at (1) Indonesia Tropical Fruit Research Institute (ITFRI) Aripan Research Station, (2) ITFRI Subang Research Station, (3) Cipaku Research Station-AIAT of West Java, and (4) Limapuluh Kota District-West Sumatera, from June 2013 to February 2014. Plant morphology characterization were performed on 33 accessions of rambutan referring to the descriptor for rambutan by IPGRI. Genetic variability studies included of calculation of genetic dissimilarity among accessions using Gower method, followed by hierarchial clustering of the accessions using average linkage approach. The results showed that the rambutan and kapulasan accessions reside in separate clusters with average dissimilarity coefficient of about 55%. Based on bunches density rambutan accessions can be classified into five groups, namely very rare, rare, medium, dense, and are very dense bunches. Accession Gendut Kair, Tangkue, and Aceh Gendut had dense to very dense bunches, while all kapulasan accessions had very rarely cluster density...

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Purpose -The purpose of the present study was to analyze the eff ect of fl exibility and interactivity on perceived utilitarian value and hedonic value, ultimately determining the satisfaction level of e-commerce users.Design/Methodology/Approach -Data were analyzed by using the Structural Equation Modeling (SEM) with AMOS 18. A sample of e-commerce users were taken by using the incidental sampling technique. A total of 650 respondents participated, forming the sample and the usable size was 415 after the screening process.Findings and implications -First: fl exibility (navigation, comfort, and the substitutability of personal examination) had an eff ect on utilitarian value, but not hedonic value; second, interactivity (controllability, synchronicity, and bi-directionality) had an eff ect on utilitarian value and hedonic value; third, perceived value had an eff ect on satisfaction. E-tailers should allocate their resources appropriately, combining the qualities Sažetak Svrha -Svrha istraživanja jest analizirati učinak prilagodljivosti i interaktivnosti na percipiranu utilitarnu vrijednost i hedonističku vrijednost, a kako bi se u konačnici odredila razina zadovoljstva korisnika elektroničkog trgovanja.Metodološki pristup -Podaci su analizirani primjenom modeliranja strukturnih jednadžbi (SEM) sa softverom AMOS 18. Korisnici elektroničke trgovine u uzorak su birani slučajnim odabirom. U istraživanju je sudjelovalo ukupno 650 ispitanika, a nakon što su prošli inicijalnu provjeru, 415 upitnika iskorišteno je za analizu.Rezultati i implikacije -Prvo: prilagodljivost (navigacija, udobnost, zamjenjivost osobnog ispitivanja) imaju učinak na utilitarnu, ali ne i na hedonističku vrijednost; drugo: interaktivnost (mogućnost kontroliranja, usklađenost i dvosmjernost) imaju učinak na utilitarnu vrijednost i na hedonističku vrijednost; treće, perci- of utilitarian and hedonic values on their website proportionally (powerfully and stylishly) well to improve the overall perceived value. When a company has limited resources, the trade-off of utilitarian and hedonic values should be well-considered. For example, adding more interesting and easy-to-understand features, such as a more fl exible and interactive live chat, would make it easier for consumers to select products/services as if performing off -line transactions.Limitations -Despite the justifi cation in the literature for using ethnicity-and region-based samples in Indonesia for Internet-related studies, those samples may not refl ect the actual overall population of online consumers worldwide.Originality -This paper develops an interactivity model by adding the fl exibility construct to increase the perceived value in e-commerce supported by the latest literature and some important recommendations for further research.Keywords -Flexibility, interactivity, utilitarian value, hedonic value, satisfaction pirana vrijednost ima učinak na zadovoljstvo. Elektroničke bi prodavaonice trebale usmjeriti resurse na odgovarajući način kombinirajući podjednako dobro kvalite...

ABSTRACT The process of excessive free radicals  in our body plays a major part in the development of chronic and degenerative illness such as cancer, autoimmune disorders, aging, cataract, rheumatoid arthritis, cardiovascular and neurodegenerative diseases. The recently study reported that free radical and oxidants play a dual role as both toxic and beneficial compounds, since they can be either harmful or helpful to the body. Therefore, natural antioxidants can be explored to prevent degenerative diseases and in the present paper we have investigated antioxidant activity of extracts from Nicolaia speciose (Bl.) Horan flower and Muntingia calabura L.  fruit for its free radical scavenging activity using 2,2-diphenyl, 1-picryl hydrazil (DPPH) radical scavenging activity. The results revealed that both ethyl acetate fractions of N.  speciaose and M. calabura have the highest antioxidant activitiy with IC50 29.81 and 14.48 µg/ml respectively.   The antioxidant activity of both ethanolic extracts were more potent than hexan and water fractions with IC50 39.27 and 137.20 µg/ml respectively. The investigation of IC50 values indicated that the antioxidant activity show moderate to very active. Active compounds were identified using thin layer chromatography with FeCl3, AlCl3, 2,4-DNPH and anisaldehide-H2SO4 spray reagents. Chromatogram of ethylacetate fraction showed that spots on the hRf 12 and 56 were thought to contain phenolic compounds with a carbonyl group, while the hRf 37 was suspected flavone compounds with 3-OH group and the hRf 50 was alleged the ortho-dihydroxy flavone or ortho hydroxy and free carbonyl. Chromatogram of ethyl acetate of talok fruits fraction showed that spots on the hRf 19.31 and 44 were suspected flavone compounds with ortho-hydroxy-carbonyl group and or ortho-hydroxy. ABSTRAK Radikal bebas berlebih dalam tubuh dapat memicu tumbuhnya sel kanker, penyumbatan pembuluh jantung, kerusakan oksidatif otak dan penuaan dini. Hal ini menyebabkan penelitian tentang potensi antioksidan terus mengalami peningkatan, terutama antioksidan alami dari tanaman. Bunga kecombrang (Nicolaia speciosa (BI.) Horan) dan buah talok (Muntingia Calabura L.) dilaporkan aktif sebagai antioksidan dan mengandung senyawa aktif dengan tingkat kepolaran yang berbeda. Oleh karena itu, penelitian ini bertujuan untuk menguji aktivitas dengan penangkapan radikal bebas fraksi-fraksi ekstrak bunga kecombrang dan buah talok serta karakterisasi golongan senyawa aktifnya. Hasil fraksinasi ekstrak diuji dengan larutan DPPH 0,4 mM dan diukur dengan spektrofotometer UV-Vis pada panjang gelombang 517 nm. Hasil absorbansi sampel dan kontrol diolah untuk mendapatkan persen penangkapan radikal DPPH dan aktivitas antioksidan dievaluasi melalui nilai IC50. Senyawa aktif diidentifikasi menggunakan kromatografi lapis tipis dengan penampak bercak FeCl3, AlCl3, 2,4-DNPH dan anisaldehid-H2SO4.  Fraksi-fraksi ekstrak bunga kecombrang dan buah talok menunjukkan tingkat kekuatan antioksidan antara sedang sampai sangat aktif. Fraksi etil asetat bunga kecombrang serta buah talok memiliki aktivitas penangkapan radikal bebas tertinggi dengan IC50 sebesar 29,81 µg/ml dan 14,48 µg/ml. Pada fraksi etil asetat ini, buah talok mempunyai potensi aktivitas antioksidan dua kali lipatnya dari bunga kecombrang.  Fraksi air, ekstrak etanol serta fraksi heksan bunga kecombrang memiliki IC50 sebesar 39,27 µg/ml, 44,08 µg/ml, dan 135,36 µg/ml. Sedangkan ekstrak etanol, fraksi air serta fraksi heksan buah talok memiliki IC50 sebesar 137,20 µg/ml, 282,47 µg/ml, dan 2611,70 µg/ml. Hasil KLT fraksi etil asetat buah kecombrang menunjukkan bahwa bercak pada hRf 12 dan 56 mengandung senyawa fenolik dengan gugus karbonil, sedangkan hRf 37 diduga senyawa flavon dengan gugus 3-OH dan pada hRf 50 merupakan flavon dengan o-dihidroksi dan atau o-hidroksi karbonil bebas. Kemudian hasil KLT fraksi etil asetat buah talok menunjukkan bahwa bercak dengan nilai hRf  19, 31, dan 44 merupakan flavon dengan gugus o-hidroksi karbonil dan atau gugus o-dihidroksi. Bercak pada hRf 31 juga mengindikasikan adanya senyawa terpenoid.