Judul: Cytotaxonomy Pteris ensiformis Burm.f.
Abstrak: The cytotaxonomy of Pteris ensiformis Burm.f. from several places in Indonesia have been studied. The information about infraspesific variation of P. ensiformis and the relationships within P. ensiformis can be used to clarify the intraspecies delimitation of P. ensiformis. The objectives of this study were to examine morphological, cytological and mode reproduction of P. ensiformis and to clarified the correlation between mode of reproduction, ploidy level and morphological variation in P. ensiformis. Therefore, the aim of this study was to examined the intraspesific variation of P. ensiformis in Indonesia. This study was conducted from September 2012 to June 2013. The morphological character was examined from 60 collections of living plants originated from Gorontalo, Lombok and various places in Java, added the specimen from Herbarium Bogoriense (BO). Cytological observations were conducted by observing somatic chromosome of root tips using squash methods. Modes of reproduction were determined by counting the number of spores of each sporangium. New cytological record of P. ensiformis var. victoriae have been found from Indonesia i.e 2n=58 (diploid sexual) from Gorontalo, Celebes and 2n=87 (triploid) from Lombok Island and Bogor West Java. The diploid sexual of var. victoriae has smaller in habitus than that of the triploid races. Cytotype tetraploid sexual (2n=116) of var. ensiformis, collected from various places in Java is an important information of cyto-reproduction data of var. ensiformis in Indonesia. Based on morphological data, P. ensiformis consistenly can be classified into two varieties namely P. ensiformis var. ensiformis and P. ensiformis var. victoriae. However, futher study to clarify their relationship among varieties is strongly recommended.
Keyword: chromosome numbers, cytotypes, Pteris ensiformis Burm.f.

Judul: Sitologi dan Tipe Reproduksi Pteris multifida Poir. (Pteridaceae)
Abstrak: Cytological observations have been carried out by several researchers in South Chine, Japan, Ceylon, Hongkong, Himalaya, and Java. The results from various regions showed that P. multifida had a fairly high genetic variation, namely diploid, triploid, and tetraploid types. Therefore cytological and reproductive study on P. multifida from its geographical distribution areas need to be done. The objectives of this research were observe the somatic chromosome number and reproductive type of P. multifida, and to recognize the relationship between morphological variation and its ploidy level as well as stomatal index. Plants were collected from several localities in Bogor. Ploidy level was determined by observing somatic chromosome number by using squash methods. Reproductive type was determined by counting spore number in each sporangium. Morphological characters examined were the stipe, lamina, pinnae, veins, and indusium. Observations of stomata and epidermis of leaves were done by making an incision paradermal leaf. Pteris multifida has two ploidy level and reproduction type, namely apogamous triploid (2n = 87) and sexual tetraploid (2n = 116). The two ploidy level could not be distinguished based on morphological characteristics, but they can be differentiated by their epidermal cells number. Apogamous triploid has fewer number of epidermal cells, the sexual tetraploid has a greater number of epidermis.
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Judul: Pembuatan Sistem Kontrol Gas Amonia Berbasis Mikrokontroler Arduino.
Abstrak: Gas amonia adalah salah satu gas yang beracun yang dapat meneyebabkan kematian pada manusia atau hewan. Dalam penelitian ini dibangun sebuah sistem pengontrol yang dapat mengatasi bahaya keracunan akibat adanya gas amonia. Sistem pengontrol dibuat menggunakan dan menggunakan relay sebagai saklar otomatis untuk kipas, kipas yang digunakan sebagai pembuang gas amonia, sensor MQ-135 sebagai sensor pendeteksi keberadaan konsentrasi gas amonia dalam satuan part per million (ppm). Sistem pengontrol beroperasi menggunakan arduino uno untuk mengirim perintah on/off otomatis pada relay sebagai saklar otomatis dari kipas, ketika sensor membaca konsentrasi gas diatas 5 ppm maka peintah yang dikirim adalah on kemudian kipas akan menyala dan apabila dibawah 5 ppm perintah yang dikirim adalah off kemudian kipas mati.
Keyword: gas amonia, sensor mq-135, relay, arduino uno, sistem pengontrol