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: Aktivitas Antioksidan dan Total Flavonoid Ekstrak Etanol Gandarusa (Justicia gendarussa Burm. F.) yang Diberi Pupuk NPK, Kandang, dan Kombinasi
Abstrak: Gandarusa (Justicia gendarussa Burm. F.) merupakan tanaman yang sering dimanfaatkan karena kandungan antioksidannya. Penelitian ini bertujuan menentukan kadar total flavonoid dan aktivitas antioksidan, serta menganalisis korelasi antara kadar total flavonoid dan aktivitas antioksidan dari ekstrak etanol daun dan batang gandarusa dengan komposisi pemupukan berbeda. Kadar total flavonoid diukur dengan metode aluminium klorida. Aktivitas antioksidan diukur dengan metode Cupric Reducing Antioxidant Capacity (CUPRAC) dan 2,2-diphenyl-1-picrylhydrazyl (DPPH). Kadar total flavonoid daun dan batang tertinggi dihasilkan dengan tanpa pemupukan sebesar 5,23 dan 1,85 mg QE/g. Aktivitas antioksidan tertinggi metode CUPRAC diperoleh pada perlakuan pupuk NPK pada sampel daun dan batang yaitu sebesar 55,25 dan 20,39 µmol TE/g, sedangkan untuk DPPH diperoleh pada perlakuan 50% pupuk kandang dan 50% pupuk NPK untuk sampel daun, dan 50% pupuk kandang dan 10% pupuk NPK untuk sampel batang, dengan nilai berturut-turut 0,39 dan 0,08 µmol TE/g. Kadar total flavonoid daun dan aktivitas antioksidan berkorelasi negatif dan tidak signifikan, sedangkan pada batang bersifat positif dan signifikan secara statistik., Gandarusa (Justicia gendarussa Burm. F.) is often used because of its antioxidant content. This study aimed to determine the total flavonoid content and antioxidant activity, and to analyze the correlation between total flavonoid content and antioxidant activity of ethanol extract of the leaves and stems of gandarusa with different fertilizer composition. Total flavonoid content was measured with aluminum chloride method. Antioxidant activity was measured using CUPRAC and DPPH method. The highest flavonoid contents of leaf and stem sample were 5,23 and 1,85 mg QE/g obtained from treatment without fertilization. The highest antioxidant activity using CUPRAC method were 55,25 and 20,39 µmol TE/g obtained from NPK fertilizer, while for DPPH was obtained from treatment of 50% manure and 50% NPK fertilizer for leaf samples, and 50% manure and 10% NPK fertilizer for stem samples, respectively 0,39 and 0.08 mol TE/g. Leaf’s flavonoid content and antioxidant activity were negatively correlated and not significant, while the correlation in stem was positive and statistically significant.
Keyword: Antioxidant activity, Aktivitas Antioksidan, Manure fertilizer, NPK fertilizer, Flavonoid, 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