Judul: Efek medan magnet terhadap kontraksi usus halus kelinci secara in vitro
Abstrak: Telah dilakukan penelitian mengenai pengaruh medan magnet terhadap kontraksi spontan usus halus kelinci secara in vitro. Dalam penelitian ini, dihitung amplitudo, frekuensi dan periode kontraksi usus halus dengan menggunakan kymogram yang dirangkai dengan organbath. Bagian usus halus, duodenum, jejunum dan ileum diisolasi dan direndam dalam larutan tyrode dengan suhu dijaga pada 37oC. Perlakuan yang diberikan berupa paparan medan magnet dengan kisaran antara 30 Gauss sampai 180 Gauss. Untuk setiap pengambilan data dan bagian usus halus diambil kontrol dan perlakuannyayang masing-masing dilakukan selama 3 menit. Hasil yang didapatkan menunjukkan terjadinya penurunan amplitudo kontraksi spontan usus halus jika dibandingkan dengan kontrol, baik pada bagian duodenum, jejunum maupun ileum. Tetapi dua parameter kontraksi lainnya, frekuensi dan periode tidak mengalami perubahan. Penurunan yang terjadi pada amplitudo kontraksi diduga terjadi karena adanya perubahan pada aliran ion Ca2+ yang disebabkan oleh gaya yang dikerahkan medan magnet terhadap ion. Gaya yang dikerahkan oleh medan magnet akan menyebabkan arah gerakan ion Ca2+ berubah, sehingga gagal masuk ke dalam intrasel otot polos. Dengan terjadinya perubahan tersebut, maka [Ca2+] yang berfungsi untuk mengaktifkan MLCK akan berkurang sehingga aktivasi MLCK terganggu. Dengan terganggunya aktivasi MLCK tersebut, maka akan terjadi penurunan kontraksi. Efek medan magnet terhadap kontraksi usus halus kelinci ini memiliki hubungan berbanding lurus. Semakin besar medan magnet yang digunakan, semakin besar pula penurunan yang terjadi.
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Judul: Kontraksi Otot Polos Usus Halus Longitudional Kelinci Akibat Paparan Medan Magnet Secara In Vitro
Abstrak: This research aims to know the response is contraction of the intestine due to exposure to the subtle variations in the intensity of the magnetic field 10-240 gauss with frequency 50 Hz in vitro. Data capture the strength and frequency of contractions using Data Asquisition System AD Instruments. Decrease in strength of contraction occurs, but not significant. Not found a strong correlation between increased the intensity of the magnetic field and a decrease in the strength of contraction. A given exposure is not strong enough to do the modulation of calcium ion mechanosensitive channel through, this is shown on a small correlation values test each of the duodenum, jejunum and illeum is -0.1561, -0.0779, and-0.3204. As well as the test F stating there is no real influence on the strength of contraction of the intestine. A similar case also happened in the contractions increased frequency is very small and not significant. Test results showed no effect on real F on the frequency of contractions and illeum the duodenum, jejunum whereas in effect is real. Not found a strong correlation between the intensity of the magnetic field with the addition of an increase in the frequency of contraction that is indicated by the value of the correlation of the duodenum, duodenal and illeum was 0.0352, 0.1665 and 0.2546.
Keyword: smooth muscle, mechanosensitive ion channels, magnetic fields, contraction, calcium

Judul: Sistem Pakar untuk Identifikasi Shorea Menggunakan Algoritme Voting Feature Interval 5
Abstrak: Shorea is a kind of meranti species that have high value. Shorea is a genus name with 194 species and belong to the Dipterocarpaceae family. Shorea has a considerable number of benefits. It is the most important timber source. Shorea can be used to produce varnish, paint and other chemical materials. One kind of Shorea is better known as tengkawang and can produce a high price oil that can be used to make cosmetics and food. The morphological similarity of Shorea makes it difficult to distinguish one Shorea to another. The identification is usually done by experts. Unfortunately, there is limited time and resource of experts to identify. Expert system is a computer system that emulates the decision making ability of human expert. This research aims to develop an expert system to identify Shorea based on morphological characteristics of Shorea. The expert system being built uses Voting Feature Intervals 5 (VFI5) algorithm to identify Shorea. The acquistion of data is done with expert to examine Shorea morphological characteristics. The acquisition is generating identification of determination key as comparison to VFI5 algoritm. The identification using VFI5 algorithm produced 99% average accuracy, and identification of Shorea performed by an expert produced 90% accuracy.
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