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Jurnal Penelitian Saintek

saintek
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Published by Universitas Negeri Yogyakarta

ISSN : 14123991 EISSN : 25287036 DOI : 10.21831

Core Subject : Science,

Decision Sciences, Operations Research & Management

Arjuna Subject : -

Articles 7 Documents

Search results for , issue "Vol 18, No 1: April 2013" : 7 Documents clear

CONTROL OF FLOWER PATHOGEN ACTIVITIES OF SOYBEAN PLANTS IN STRAIN COCONUTION PSEUDOMONAS SP. AND BACILLUS SP. WITH BRADYRHIZOBIUMJAPONICUM Nunung Sulistyani; Aris Tri Wahyudi; Giyanto Giyanto
Jurnal Penelitian Saintek Vol 18, No 1: April 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Plant growth promoting rhizobacteria (PGPR) is a bacterial colonization of plant roots that can stimulate the growth of plants directly or indirectly. The PGPR mechanism indirectly results in plant growth as it suppresses the growth of phytopathogen. This study aims to determine the ability of Pseudomonas sp. and Bacillus sp. in controlling the pathogenic root fungal pathogenic fungi. Isolates in this study were Pseudomonas sp. Crb 3, Crb 17, Crb 17i, Crb 68 and Bacillus sp. Cr 24, Cr 44, Cr 66 co-inoculated with B. japonicum in soybean plants in greenhouses. An antagonistic activity test was performed on all isolates and all isolates showed no antagonistic activity. Treatment of combination of strain Pseudomonas sp.Crb 17, Crb 17i and Bacillus sp. Cr 24 inoculated with B. japonicum suppresses the growth of root rot fungi and increases peroxidase. Therefore, Pseudomonas sp. Crb 17, Crb 17i and Bacillus sp. Cr 24 can be used as a biocontrol agent for pathogenic fungi causing plant root disease.

OPTIMIZATION OF NEURO FUZZY MODEL FOR DATA TIME SERIES WITH SINGULAR VALUE DECOMPOSITION METHOD Agus Maman Abadi; Dhoriva Urwatul Wutsqa
Jurnal Penelitian Saintek Vol 18, No 1: April 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study aims to develop new procedures in optimal neuro fuzzy modeling for time series data. Specifically in this research, the development of new procedure in modeling fuzzy Takagi-Sugeno-Kang order one for time series data which parameter-parametemic determination is done by singular value and neural network decomposition method, in order to obtain method of forming neuro fuzzy model for time series data optimal. In this research, we have developed a procedure to get the optimal Takagi-Sugeno-Kang fuzzy model for time series data by optimizing the parameter value search in consequence of fuzzy rule using singular value decomposition method. A new model of neuro fuzzy modeling is optimized, the fuzzy model whose parametem optimization is based on the neural network by the singular value decomposition method. Parameters in consequent part of the rule of fuzzy are optimized by the singular value decomposition method and the parameters in the antecedent part of the fuzzy rule are optimized based on neural network backpropagation with gradient descent method.

APPLICATION OF E-LEARNING ADAPT TECHNOLOGY IF TO OVERCOME LEARNING DESIGNS Herman Dwi Surjono
Jurnal Penelitian Saintek Vol 18, No 1: April 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

This study aims to design and implement adaptive e-learning technology to address the diversity of student learning styles. This system is expected to overcome the problems of conventional e-learning that gives the same material to each user. This research uses the R D approach. The research procedure includes: (a) analysis, (b) design, (c) implementation, and (d) evaluation. Analysis of consistency and accuracy of the contents carried out on the data at the stage of analysis and design. Descriptive analysis is performed on all data that can be tabulated so that meaningful. The result of this research is adaptive e-learning model to the diversity of student learning style. In the development process is generated also documentation needs description, function description, main features, architecture, and use case diagrams. The e-learning model is implemented with LMS Moodle and the adaptive function is made in module form. Performance, the first system identifies the trend of learning styles through a questionnaire that is Visual, Auditory, or Kinesthetic. Furthermore scores are used by the system as the basis for giving different materials to the students.

NANOPARTIKEL APPLICATION OF TIN WHITE PRODUCTS AS A MICROSENSOR ETHANOL M. Pranjoto Utomo; Endang Widjayanti LFX; Anti Kolonial Prodjosantoso; Rini Wulandari
Jurnal Penelitian Saintek Vol 18, No 1: April 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Penelitian ini bertujuan untuk mengetahui karakter SnOz, kemampuan adsorpsi dan kepekaan mikrosensor timah oksida terhadap etanol. Timah oksida (SnOz) disintesis melalui metode sol-gel. Terbentuknya Sn02 dipelajari dengan cara membandingkan difraktrogram Sn02 hasil sintesis dengan difraktogram standar JCPDS. Adsorpsi etanol pada permukaan SnOz dipelajari berdasar spektra FTIR sebelum dan sesudah proses adsorpsi. Daya adsorpsi Sn02 terhadap etanol pada berbagai waktu pemaparan ditentukan dengan menggunakan metode Micro Conway Diffusion. Konduktivitas listrik Sn02 sebelum dan sesudah adsorpsi pada berbagai waktu pemaparan ditentukan berdasarkan resistansi Sn02. Hasil penelitian menunjukkan bahwa Sn02 berhasil disintesis berdasarkan kemiripan puncak pada difraktogram hasil sintesis dengan puncak pada difraktogram standar, yaitu pada 29: 26,48; 33,87; 51,72. Adsorbsi Sn02 terhadap etanol ditunjukkan dengan adanya serapan baru pada 1300-1000 em" (serapan khas gugus -CO). Daya adsorpsi per gram Sn02 pada waktu pemaparan 3, 10, dan 30 menit masing-masing adalah 0,0222 g, 0,0224 g, dan 0,0226 g. Konduktivitas listrik Sn02 sebelum proses adsorpsi adalah 2,042x10-5 S/cm. Konduktivitas SnOz sesudah proses adsorpsi terhadap etanol cair pada waktu pemaparan 3, 5, 10, 20, dan 30 menit secara berurutan adalah 94,783x10-5 , 82,935x10-5 , 66,348x10-5 , 64,730x10-5 dan 63,189x10-5 S/cm. Konduktivitas SnOz terhadap gas etanol pada waktu pemaparan 3, 5 dan 10 menit secara berurutan adalah 0,332xlO-5, 0,295x10-5 dan 0,265x10-5 S/cm.

ANTIOXIDANT ACTIVITY AND ANTIKANKER DERIVATING BENZALASETON Sri Handayani; Retno Arianingrum; Winarto Haryadi
Jurnal Penelitian Saintek Vol 18, No 1: April 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Modification of vanillin structure to vanililacetone and divanililaseton and its activity test as antioxidant and anticancer have been done. The structural modification is carried out by condensation of the crosslinked aldol in an alkaline atmosphere with the aqueous ethanol solvent for 3 hours at 10 ° C. The antioxidant activity test on the synthesis compound was done by deoxyribose degradation method, while the anticancer activity test was done by MTT method. The results of antioxidant activity test show that the divanililaseton with IC50 is 873 ug / ml. more active than vanililacetone with IC50 of 11,765 ug / ml .. IC50 data for anticancer activity against cancer cell HeLa vanilinaseton and divanilinaseton respectively of 51.68 and 10.26 ug / ml. These results show that both compounds are very toxic to HeLa cancer cells.

VARIATIONS OF MANITOL LEVEL AND CORN SYRUP AS A BASE IN NUTRASEUTICAL FORMULATION OF GUMMY CANDIES SUGAR CANE SARI MARKISA YELLOW (Passiflora edulis var. Flavicanpa) Feris Firdaus; Fajriyanto Fajriyanto
Jurnal Penelitian Saintek Vol 18, No 1: April 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

The yellow passion fruit (Passiflora edulis var. Jlavicarpa) is formulated into a nutraceutical product in the form of a gummy candies preparation. Furthermore, various tests of gummy candies produced were organoleptic test, weight uniformity test, and favorite level test. Based on the results of the research, yellow passion fruit (Passiflora edulis var.jlavicarpa) can be formulated into good nutraceutical products in the form of gummy candies preparations. The result of organoleptic test showed that the preparation of gummy candies formula 3 with the base of mannitol and corn syrup (25%: 75%) had the best form, color, taste, odor and texture compared to other formula. Based on the results of uniformity test weight is known that the variation in the ratio of mannitol and corn syrup as the basis of gummy candies does not affect the uniformity of weight but affects the form of gummy candies preparations. Based on the results of hedonic test of respondents for the parameters of shape, color, taste, odor, and texture of gummy candies of passion fruit essence, formula 3 is the most preferred formula by the respondents.

TESTER KIT TO TEST BORAKS IN FOOD Regina Tutik Padmaningrum; Siti Mawarti
Jurnal Penelitian Saintek Vol 18, No 1: April 2013
Publisher : Institute of Research and Community Services, Universitas Negeri Yogyakarta

Boraks digunakan sebagai pengenyal dan pengawet makanan mempunyai efek negatif terhadap kesehatan, sehingga perlu dikembangkan alat yang dapat menguji boraks dalam makanan secara sederhana, cepat, dan praktis. Penelitian ini bertujuan mengembangkan 2 tester kit berdasarkan reaksi kimia yang spesifik antara boraks dengan pereaksi tertentu, yaitu pereaksi barium klorida dan HCI-NaOH-manitol. Penelitian ini dilakukan menggunakan metode penelitian pengembangan. Model pengembangan yang digunakan adalah model prosedural. Pengembangan tester kit melalui beberapa tahap, yaitu: a) tahap perencanaan: pemilihan pereaksi yang spesifik secara teoritis (kajian teoritis), b) tahap pengorganisasian: uji coba reaksi antara larutan boraks dengan pereaksi spesifik dan penentuan komposisi stoikiometris antara pereaksi dengan boraks, c) tahap pelaksanaan: penyusunan tester kit, prosedur uji, keterangan fungsi tester, petunjuk keamanan dan cara penyimpanan. Tester kit yang dikembangkan terdiri atas a) seperangkat alat sederhana seperti botol bertutup dan pipet tetes, b) pereaksi kimia, c) prosedur uji, d) petunjuk keamanan, e) cara penyimpanan, batas deteksi, akurasi, dan f) keterangan fungsi tester kit.

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