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Articles by Nurhayati
Total Records ( 3 ) for Nurhayati
  Noverita Sprinse Vinolina , Luthfi Siregar , Bilter Sirat , Nurhayati , Enny Adelina and Laila Nazirah
  Background and Objectives: Pegagan, Centella asiatica (L) Urban is an important traditional herb and its wild population is currently heavily exploited due to commercial cultivation shortage. This study evaluated the content of different bioactive compounds in the leaves and roots of Pegagan, Centella asiatica (L) Urban cultivated in field condition and harvested at different times. Materials and Methods: The contents of centellosides in the leaves and roots of field-cultivated Deli Serdang Pegagan Accession were determined by using ultra fast liquid chromatography system. The levels of bioactive compounds in relation to harvest time were compared with an additional discussion on the dry/wet weight relationship. Results: The result showed that asiaticoside and madecassoside increased while asiatic acid decreased over time in both the leaves and roots of Pegagan. However, the leaves were shown to have significantly higher amounts of all centellosides compared to the roots in all harvest time treatments. Conclusion: This study concluded that a late harvest of Pegagan is best to maximize the production of asiaticoside and madecassoside. Conversely, early harvest was best to the maximum amount of asiatic acid in Pegagan.
  Bilter A. Sirait , Agnes Imelda Manurung , Osten M. Samosir , Robert G. Marpaung , Nurhayati and Chichi Manalu
  Background and Objective: The problem of fertilization in Indonesia is indeed complex, especially on palm oil seedling. This study aimed to observe the effect of NPK treatment and frequency of watering to growth and proline of palm oil seedlings in pre-nursery. Materials and Methods: The experiment was done in June-September 2019. This experiment uses the RCBD Factorial method consisting of 2 treatment factors: NPK consists of 3 levels, namely, N1 = 5.0 g planting per media, N2 = 10.0 g planting per media, N3 = 15.0 g planting per media, Frequency of watering consisting of 4 levels namely L0 = 200 mL water planting per media day1, L1 = 200 mL water planting per media days3, L2 = 200 mL water planting per media days5, L3 = 200 mL water planting per media days7. The observation variables which reflect plant growth namely plant height, stem diameter, number of leaves, leaf area and one of the characteristics lack of water namely leaf proline. Results: Fertilizer NPK up to 15 g planting per media has a trend increase plant growth of palm oil seedlings in pre-nursery, frequency of watering significantly decreases plant growth, on treatment 200 mL water planting per media days7 increases the proline content about 3.26 mM g1. The combination of NPK fertilizer and frequency of watering has no significant effect. Conclusion: Hence it was concluded that NPK has no significant effect to the growth of seedlings, the frequency of watering which is rarely caused the growth of seedling decreased but the proline content increased in leaves.
  Nurhayati , Nuzulia Irawati , Eryati Darwin and Nur Indrawaty Lipoeto
  Background and Objective: Geohelminth is a common cause of chronic infections in humans. Worm infections have been shown to have a protective effect against some diseases. The effect is related to the ability of the worm to modulate the host immune response through Th2. The aim of study was to investigate the correlation between IL-10 levels and blood cholesterol and glucose in geohelminth positive human subjects with mature immune systems. Materials and Methods: Stool examination for geohelminth was done by direct method using iodine and by Kato Katz method. IL-10 levels were measured by indirect enzyme-linked immunosorbent assays (ELISA) method. Total plasma cholesterol levels were examined by CHOD-PAP method and fasting blood glucose was measured using hexokinase method. Results: All subjects infected with geohelminth classified as a mild infection. There was no correlation between IL-10 levels and EC/GC (p>0.05) but there was a negative correlation between IL-10 levels with TC levels (p<0.01) and between IL-10 levels and FBG levels (p<0.01). Conclusion: A negative correlation between IL-10, TC and FBG further strengthens support for the role of Th2 especially IL-10 to low cholesterol and blood glucose levels in geohelminth infections.
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