Poensial Osmotik dan Plasmolisis

Plasmolisis adalah peristiwa lepasnya plasmalema atau membran plasma dari dinding sel karena dehidrasi (sel kehilangan air). Peristiwa ini terjadi apabila jaringan ditempatkan pada larutan yang hipertonis atau memiliki potensial osmotik yang tinggi. Dalam keadaan tersebut, air sel akan terdorong untuk berdifusi keluar sel menembus membran (osmosis). Salah satu fenomena akibat dehidrasi sel ini adalah terjadinya plasmolisis. Dalam keadaan tertentu sel masih mampu kembali ke kadaan semula bila jaringan dikembalikan ke air murni. Peristiwa ini dikenal dengan nama deplasmolisis. Bila jaringan ditempatkan pada larutan yang hipotonis sampai isotonis, maka sel-sel jaringan tidak akan mengalami plasmolisis. Berdasarkan hal ini, maka metode plasmolisis dapat digunakan sebagai salah satu metode panaksiran nilai potensial osmotik jaringan. sebagai penaksiran terdekat potensial osmotik jaringan ditaksir eqivalen dengan potensial osmotik suati larutan yang tela menimbulkan plasmolisis sebesar 50% yang disebut incipient plasmolisis

SELAMAT HARI NATAL

Selasa, tanggal 25 Desember 2012, pada tanggal ini biasanya para umat kristen dan protestan merayakan hari raya mereka yatiu hari natal. Dan selanjutnya akan berlanjut dangan datangnya tahun baru. perayaan ini merupakan serangkaian acara dari para umat kristen dan protestan.

SELAMAT NATAL DAN TAHUN BARU bagi yang merayakan.
Jangan ada lagi anarki yang terjadi untuk merusak kebersamaan dan kerukunan antar agama.

The Roles of Knowing Psycholinguistics for English Teacher

The Roles of Knowing Psycholinguistics for English Teacher

Psycholinguistics is a study of psychological process about language competence and its implementation. It can be concluded that psycholinguistic is a science, which studies language in relation with psychological process, occurred when people speak including comprehending aspect and produce language sign.

In the language teaching and learning process, students have their steps to acquire all the materials in line with the development of mind. In daily life, people often want to say something but do not know how to say that thing in mind. It is because of the limited vocabularies that they have.

Psycholinguistic principle explains that receiving and producing utterance are the early steps of language learning. In second language learning, students should love listening, imitating, and speaking activity. Because of that teacher should apply behaviouristic theory that majoring the three of them. Students will learn how to speak by listening and imitating their teacher. Therefore, mastering foreign language to achieve acquisition level, learners need to do oral activity like listening and imitating/pronouncing then do communicative activity actively. Reading and writing activity and grammar mastery can be done later.

Above is a way to start teaching a second language by recognizing the psycological process. Studying psycholinguistics makes the teacher know how to teach their students. They will know how the development of mind of their students by this psycolinguistics. After that, they will know how to teach their student with a suitable way in line with the students’ mind development. Then, the process of teaching and learning the second language will produce a great result.