Judul: Phenolic Content and Antioxidant Activity Gendarussa  Methanol Extract Cultivated with the Combination of Manure and NPK Fertilizers
Abstrak: Pengaplikasian pupuk organik dan anorganik akan memengaruhi kadar senyawa fenolik tanaman gandarusa. Penelitian ini bertujuan menentukan metode budidaya terbaik melalui aplikasi pupuk kandang, NPK, atau kombinasi keduanya terhadap kadar total fenolik dan aktivitas antioksidan ekstrak metanol daun dan batang gandarusa. Tanaman gandarusa dibudidaya dengan enam perlakuan, yakni kontrol (T1), pupuk kandang (T2), NPK (T3), 50% pupuk kandang + 50% NPK (T4), 50% pupuk kandang + 10% NPK (T5), dan 10% pupuk kandang + 50 % NPK (T6). Total fenolik diukur dengan metode Folin Ciocalteu. Aktivitas antioksidan diukur dengan metode Ferric Reducing Antioxidant Power (FRAP) dan 2,2’-difenil-1-pikrilhidrazil (DPPH). Kadar total fenolik tertinggi diperoleh pada perlakuan T3 daun dan T6 batang (4,28 dan 2,54 mg GAE/g bobot kering). Aktivitas antioksidan FRAP tertinggi diperoleh pada perlakuan T3 daun dan batang, sedangkan pada metode DPPH perlakuan T1 daun dan T6 batang menunjukkan aktivitas tertinggi (11,54; 5,31; 0,64; 0,19 µmol TE/g bobot kering). Kadar total fenolik hanya menunjukkan korelasi yang positif dan signifikan terhadap aktivitas antioksidan sampel daun metode FRAP., The application of organic and inorganic fertilizers affects to the levels of gendarussa plant’s phenolic compounds. This research aims to determine the best cultivation method using manure, NPK, or the combination to achieve the highest phenolic content and antioxidant activity in methanol extract of gendarussa. Gendarussa plants are cultivated with six treatments, control (T1), manure (T2), NPK (T3), 50% manure + 50% NPK (T4), 50% manure + 10% NPK (T5), and 10% manure + 50% NPK (T6). Total phenolic was measured by Folin Ciocalteu method. Antioxidant activity was determined by FRAP and DPPH assay. The highest phenolic content was obtained from sample T3 (leaf) and T6 (stem) (4,28 and 2,54 mg GAE/g dry weight). The highest FRAP antioxidant activity was obtained from sample T3 of both leaf and stem, while the highest DPPH antioxidant acitivity was obatained from sample T1 (leaf) and T6 (stem) (11,54; 5,31; 0,64; 0,19 µmol TE/g dry weight). Total phenolic content only shows a positive and significant correlation to the antioxidant activity of leaf samples using FRAP assay.
Keyword: Antioxidant activity, Gendarussa, Manure fertilizer, NPK fertilizer, Phenolic

Judul: Phenolic Content and Antioxidant Activity of Gendarussa Ethanolic Extract Cultivated with Manure and NPK Fertilizer
Abstrak: Nutrisi dapat mempengaruhi kandungan fenolik tanaman Justicia gendarussa Burm f. (gandarusa). Penelitian ini bertujuan memperoleh informasi komposisi pemupukan gandarusa dengan kadar total fenolik dan aktivitas antioksidan tertinggi, dan menganalisis korelasi antara kadar fenolik dan aktivitas antioksidan yang diperoleh. Pupuk yang digunakan adalah pupuk kandang, NPK, dan kontrol tanpa pemupukan. Laju aplikasi pemupukan 10% dan 50%. Sampel dimaserasi dengan etanol. Kadar total fenolik diukur dengan metode Folin-Ciocalteu. Aktivitas antioksidan diukur dengan metode Ferric Reducing Antioxidant Power (FRAP) dan 2,2’-Azino-bis (3-ethylbenzothiazoline-6-sulfonic acid) (ABTS). Korelasi dianalisis dengan uji Pearson’s. Kadar total fenolik daun dan batang tertinggi diperoleh pada perlakuan 50% pupuk kandang dan 50% pupuk NPK sebesar 8 dan 5 mg EAG g-1 bobot kering. Aktivitas antioksidan tertinggi diperoleh pada sampel daun perlakuan 50% pupuk kandang dan 50% pupuk NPK (FRAP) dan perlakuan pupuk NPK (ABTS), serta sampel batang perlakuan pupuk NPK (FRAP) dan kontrol (ABTS), dengan nilai berturut-turut 21, 25, 12 dan 27 µmol KAET g-1 bobot kering. Kadar total fenolik daun dan aktivitas antioksidannya berkorelasi positif, sedangkan korelasi pada batang tidak bersifat signifikan secara statistik., Nutrient can affect gendarussa plant’s phenolic content. The objective of the research is to obtain the fertilizing condition yielding the highest phenolic content and antioxidant activity on gendarussa, and analyze the correlation between the obtained phenolic content and antioxidant activity. Fertilizers used were manure, NPK, and no fertilizer being the control. Fertilizing application rate were 10% and 50%. Sample was macerated with ethanol. Total phenolic content was measured with Folin-Ciocalteu method. Antioxidant activity was measured with FRAP and ABTS assay. Correlation was analyzed with Pearson’s test. The highest phenolic contents were 8 and 5 mg GAE g-1 dry weight obtained from treatment 50% manure and 50% NPK of leaf and stem sample. The highest antioxidant activity were 21, 25, 12 and 27 µmol TEAC g-1 dry weight obtained from leaf 50% manure and 50% NPK (FRAP) and NPK sample (ABTS), and stem’s NPK (FRAP) and control (ABTS) sample. Leaf’s phenolic content and antioxidant activity were positively correlated, while that of the stem were insignificant.
Keyword: Pupuk, Nutrisi tanaman, Gandarusa, Fenolik, Aktivitas antioksidan, Antioxidant activity, Fertilizer, Gendarussa, Phenolic, Plant nutrition

Judul: Algorithm construction of HLI hash function
Abstrak: Cryptography is a study of mathematical techniques related to aspects of information security regarding on confidentiality, data integrity, entity authentication, and data origin authentication. Data integrity is a service, which is associated with the conversion of data carried out by unauthorized parties. To maintain data integrity, one can use hash functions. An hash function is a computationally efficient function to map an arbitrary length bitstring to a fixed length bitstring called as hash value. The use of hash function in maintaining the information integrity and authentication is in digital signatures, virus protection, and software distribution. Illustration of the hash function in the integrity and authentication of information that is emailed as follow. The sender sends the information and hash value to the recipient. If the hash value of the information is equal to the hash value that is sent by the sender, then information has not been changed. Otherwise the information has been changed. An hash function has two properties, one way and collision resistance. An hash function is called one way if it is computationally infeasible to find any input such that when given any hash value . Meanwhile an hash function is called collision resistant if it is computationally infeasible to find any two inputs where such that . The purpose of this study is to construct a HLI hash function algorithm, to analyze the speed and security of the hash functions as a results of construction. Furthermore, it is to compare it with SWIFFT. Hash function is constructed based on the result of algebraic operations on modular polynomial ringwith . Modular polynomial ring noted as is a set of all polynomials of degree at most with coefficients in . can be represented as a set of integer vector of modulo in dimension . So, it is simple to implement in a computer. In vector operations, is lattice . Furthermore, alattice that is defined from certain polynomial ring is called ideal lattice. HLI hash function is consists of addition and multiplication algorithm in the ring. Addition algorithm consists of sumation operations of modulo and multiplication consists of multiplication operations of modulo . Generally, algorithm of HLI hash function consists of multiplication operations of modulo and addition operations of modulo . However, if the input is binary number then multiplication algorithm only consists of multiplication operation of modulo , so algorithm of HLI hash function consists of multiplication operations of modulo and addtion operations of modulo . An hash function is secured if it has two properties, i.e., one way and collision resistance. HLI hash function hash is one way, it is following the proof of Micciancio. It is has collision resistant because of polynomial is irreducible over and monic. Moreover, it is proved that for every unit vector , the vector is small vector. If the input of hash function is a binary number then HLI hash function only involves addition operations of modulo . So the time that used almost same with SWIFFT. The excellence of HLI hash function is the key size smaller than SWIFFT. This effect on
Keyword: hash function, modular polynomial ring, lattice