Nothaphoebe coriacea (in Kalimantan, Indonesia, commonly known as gemor) is a native wetland-plants that can grow well in swampy areas. This tree is distributed throughout South and Central Kalimantan, Indonesia. The bark of Nothaphoebe coriacea is used for bioactive compound source for larvacide, mosquito repellent, hio and glue. The objective of this research was to investigate the ultrasound-assisted extraction methods for the extraction of antioxidants compounds of Nothaphoebe coriacea. The barks were subjected to ultrasound‐assisted ethanolic and hexane extraction followed by fractionation (using ethyl acetate, chloroform, and hexane) and the antioxidant activity test was performed. The activity of antioxidant was carried out through a DPPH method. The highest antioxidant activities are shown in ethanol extract with IC50 value of 72.36 μg/mL and chloroform fraction of ethanol extract with IC50 value of 54.18 μg/mL.

Cellulose is the most abundant polymer on earth consisting of ?-l, 4 glycoside rings bound to ?-D-glucose. Cellulose can be obtained from various wood and non-wood sources. Nanocellulose is one of the cellulose derivatives that have the potential to be developed as a carrier agent for natural materials to increase their bioactivity and bioavailability. Nanocellulose, which is cellulose with a nano-size (1-100 nanometer), has been proved as one of the functional material sources that have superior properties due to its attractive and excellent characteristics such as high aspect ratio, better mechanical properties, biocompatibility renewable, and abundance. This paper discusses the sources, production methods, and applications of nano cellulose as a slow-release agent for various natural materials to an applications of biomedical, cosmetic, and biotechnology.

Wedding invitations become important in a marriage. Through invitations, they invite and hope people come to their happy day. With the development of the era in the digital era today. Communication can be built through any media. Good communication will create suitable expectations. The purpose of this study designed to find out that business opportunities in the field of creating wedding invitation websites are very good. For those who do not have time and hassle to prepare all the wedding preparations. With time and distance that is an obstacle to spreading invitations. This research used a descriptive qualitative method by collecting data through interviews, observations, literature studies, documentation to get facts and data. The results of this study indicate that by using this wedding invitation website consumers can more easily spread to friends and family quickly. Many consumers do not have much time to distribute invitations. And that's expensive if you hire an invitation delivery service for all those invited. With this web site an alternative in spreading invitations.

MENENTUKAN SOLUSI NUMERIK MODEL DINAMIK SUHU DAN TEKANAN UDARA DI ATMOSFER DENGAN METODE RUNGE KUTTA ORDE EMPAT