THE EFFECT OF STRENGTH EXERCISES ON VERTICAL JUMP IN HANDBALL PLAYERS WITH AGES BETWEEN 15 AND 17

In our study, we tried to investigate the effect of strength exercises with handball players on vertical jump. 24 athletes (n = 12 Experiment A group, n = 12 Experiment B group), who struggled with the handball league infrastructure with the ages between 15 and 17, participated in our research. In addition to the technical and tactical exercises 3 days a week for 8 weeks, the experimental group A carried out the Olympic lifts 2 days a week. In addition to the technical tactical exercises 3 days a week, the experimental group B carried out 2 days of force exercises without Olympic lifts. As a result of the pre-test and post test data of the Experiment A and Experiment B groups, the statistical analysis of the values obtained was made according to the paired group t-test and independent group t-test, and the correlations of the measurements were interpreted. There was no significant difference in the weight and measurements of the Experiment Group A before and after the training (p <0.05). A significant difference in vertical jump, fat percentage and height measurements were found (p <0.05). In the Experiment Group B, no significant difference was found in weight, fat percentage measurements (p <0.05). However, there was a significant difference in height, vertical jump measurements (p <0.05). When the independent group t-test results between the two groups were examined, no significant difference was found in height, weight, fat percentage measurements (p <0.05). However, the significant difference between the experimental A group vertical jump 1st and 2nd measurement averages was found to be significantly larger than the Experiment Group B vertical jump 1st and 2nd measurement averages (p <0.05). As a result, it was observed that the strength exercises performed with the Olympic lifts in the handball players of the 15 - 17 age group increased the vertical jump force more than the other strength exercises without the Olympic lifts. In addition, there was a significant difference in height measurements in both groups. We think that the reason for this may be due to the fact that the subjects were still in the development age. A significant difference was found in Experiment A group fat percentage measurements and body fat percentage was lower than before. We think this is due to muscle hypertrophy.  Article visualizations

Isolation and Identification of Hydrocarbon-Degrading Bacteria that Tolerant to Saponin of Sapindus Rarak Plant

A commercial saponin as biosurfactant can reduce the surface tension of water and increase of hydrocarbon degradation. However, this saponin can be toxic to some hydrocarbonoclastic bac-teria. This study aimed to obtain bacterial isolates that were tolerant and incapable to degrade saponin, and to identify them based on 16S rDNA sequence. Bacteria were isolated from petroleum contaminated soil in Wonocolo Village, Bojonegoro Regency, East Java, Indonesia. The soil samples were acclimated using Bushnell-Haas (BH) broth with 0.5% crude oil at room temperature for 3 weeks. The culture was spread onto BH agar incubated at 30°C for 7 days. The first screened, isolates were grown in nutrient broth with addition of sap-onin 0%, 8%, and 12% (v/v) then incubated at 30°C for three days. The bacterial cell density was measured using a spectrophotometer. Second screened, the isolates were grown on BH broth with addition of 0.5% saponin as a sole carbon source, and their cell densities were measured. The selected isolates were identified based on 16S rDNA sequences. Among 34 bacterial isolates, nine isolates were tol-erant to 12% saponin. Three bacterial isolates IHT1.3, IHT1.5, and IHT3.24 tolerant to high concentration of saponin and did not use this substance as growth nutrition. The IHT1.3, IHT1.5, and IHT3.24 isolates were identified as Ochrobactrum pseudogrignonense (99% similarity), Pseudomonas mendocina (99%), and Ochrobactrum pi-tuitosum; (97%), respectively. Those three selected isolates are good candidates as hydrocarbon-degrading bacteria to bioremediation of soil contaminated crude oil. However, the combined activity of bacteria and saponin to degrade hydrocarbon needs further study.

Experiment On EDM Machining For Advance Engineering Material Using Taguchi Method

Electro-discharge machining (EDM) technique is widely used for machining hard metals and for performing specific tasks which cannot be achieved using conventional technique. The most frequently used industrial application of die-sinking is mould fabrication. In this project, the main purpose is to optimize the quality of cut for tool steel (hardened) using Taguchi single response and multiple response performance characteristic. The orthogonal array, single and multi-response signal-to-noise ratio and analysis of variance are employed to study the cutting characteristic in EDM. The study needs to optimize three parameters; current, gap and pulse duration to get best surface roughness, material removal rate and electrode wear rate. The optimal combination of parameters obtained in both single response and multiple response performance characteristic shows significant improvement in cutting quality. Taguchi method is an effective approach to optimized process parameter with given cutting characteristic

A Bibliometric Mapping of Plant-Based Milk

Non-dairy or plant-based milk is one of the new food products derived from plants. It is essential to explore the plant milk market from the different raw materials that can be used, understand the different products we can obtain from plant milk, as well as improve the characteristics of the plant milk. To do the exploratory, bibliographic research can be performed. Therefore, we applied bibliographic analysis to identify and explore the most advanced technology in plant milk research. Data was collected by using Harzing's Publish or Perish (PoP), saved as CSV and RIS, filtered and refined, and then analyzed using descriptive statistics and VOSviewer. We screened 485 papers (2012-2022) related to plant-based milk from 998 publications since 1981. Related keywords or terms of screened papers were then visualized by VOSviewer into network, overlay, and density visualization map. Based on the visualization map, there were 7 clusters of plant-based milk research field. The novelty of the research covered the importance and development of plant-based milk derivate, correlation to life cycle assessment, and occurrence of milk allergy. The term “diet” became the highest density term in publication between 2012 to 2022. On the other hand, the terms “sensory attribute”, “traditional plant”, and “health benefit” became the lowest density term

The removal of remazol brilliant blue dyes from liquid waste using nano montmorillonite from bentonite of Bener Meriah Aceh

Research on the potential of nano montmorillonite as an adsorbent for Remazol Brilliant Blue dye waste has been carried out. Nano montmorillonite was isolated from Bener Meriah bentonite, Aceh, to be used as an adsorbent. The optimum conditions for adsorption of Remazol Brilliant Blue dye using nano montmorillonite occurred at a contact time of 60 minutes, pH 4, and adsorbent mass of 2 grams. The results showed that the adsorption of Remazol Brilliant Blue dye by nano montmorillonite followed the Freundlich isotherm model with R2 = 0.9858. The results of the regeneration test show that the montmorillonite nano adsorbent can be used repeatedl

Detection of Plantaricin-Encoding Gene and Its Partial Purification in Lactobacillus plantarum BP102

Lactobacillus plantarum BP102 isolated from garlic bulb tissue has probiotic properties, including producing bacteriocin called plantaricin. This study aimed to detect the gene encoding bacteriocin produced by Lactobacillus plantarum BP102, and to evaluate the bacteriocin activity at each stage of partial purification. After the end of the log phase of L. plantarum BP102 was determined, and the bacteriocin-encoding genes were checked by PCR technique. Partial purification of bacteriocin was elucidated including pH-neutralized cell-free-supernatant (CFS), precipitation using 80% of ammonium sulfate, and dialysis (cut-off 10 kDa), then the bacteriocin activity in every partial purification stage was evaluated. The molecular weight of plantaricin was estimated using SDS-PAGE analysis. Lactobacillus plantarum BP102 harbored the gene encoding plantaricin (pln) biosynthesis, namely plnEF and plnK genes. The activity of crude bacteriocin was inactivated by the presence of proteinase-K enzyme. The protein concentration was gradually decreased along with the purification process. The bacteriocin activity was demonstrated at each step of the purification process (CFS, precipitation, and dialysis) against Bacillus cereus by 9.23 ± 0.20 mm, 7.86 ± 0.15 mm, and 7.6 ± 0.10 mm, respectively; while, Escherichia coli by 10.3 ± 0.55 mm, 7.4 ± 0.1 mm, and 6.86 ± 0.45, respectively. The molecular weight of partially purified bacteriocin BP102 was found to be approximately 15.9 kDa. The overlaid part of the gel showed a slight inhibition against E. coli due to a low protein concentration. This bacteriocin purification process should be further optimized to improve the bacteriocin activity that could be useful for food preservation

Biodegradable Plastics From a Mixture of Low Density Polyethylene (Ldpe) and Cassava Starch with the Addition of Acrylic Acid

A research of preparation biodegradable plastics, from LDPE and cassava starch mixture with the addition of acrylic acid, had been conducted. This research purpose to studied compatibility properties of the material and percent weight loss during the biodegradation test. Optimum weight loss (59,26% ) was showed after 60 days witches LDPE and starch composition ratio 6 : 4 (w/w) while tensile strength equal to 0,38 Kgf/mm2. SEM characterization showed that biodegradation has occurred by formation of hole in the biodegradable plastic surface. DTA test gave Tg = 130 °C, Tm = 230 °C and Td = 370-450 °C while FT-IR analysis showed that the biodegradable plastics have a chemistry interaction