Selamat datang di ForSa! Forum diskusi seputar sains, teknologi dan pendidikan Indonesia.
0 Anggota dan 4 Pengunjung sedang melihat topik ini.
Maksud ku, makhluk hidup yang gak perlu oksigen untuk bernafas, gak perlu makan,dll?benar kan ni masuk thread bio???
Ada juga makhluk hidup yang bisa bertahan hidup dengan membentuk spora jika kondisi lingkungan tidak menunjang kehidupannya. Spora ini memang sifatnya inaktif atau dormant. Bahkan ia bisa bertahan sampai jutaan tahun tanpa adanya metabolisme energi. Tapi spora sendiri tidak bisa diidentikkan dengan jasad hidup. Sebab ia dalam keadaan inaktif, dan hanya dalam keadaan atau kondisi lingkunagn tertentu ia menjadi aktif kembali dengan bergerminasi. Jadi untuk bisa disebut "hidup" ia harus menyadap energi bebas dari lingkungan.
klo penelitian tentang trigardatus gimana bung hendi, dalam penelitian itu hewan tersebut dikeringkan selama berbulan-bulan (2bulan) sehingga tidak ada unsur yg masuk ato keluar artinya tidak ada metabolisme tapi setelah 2 bulan diberi air lagi ia hidup lagi, bila diberinya lebih dari 2bulan ia akan mati.
Anhydrobiosis is the most studied form of cryptobiosis and occurs in situations of extreme desiccation. The term anhydrobiosis derives from the Greek for "life without water" and is most commonly used for the desiccation tolerance observed in certain invertebrate animals such as bdelloid rotifers, tardigrades, brine shrimp and nematodes. However, other life forms, including the resurrection plant Craterostigma plantagineum, the majority of plant seeds, and many micro-organisms such as bakers' yeast, also exhibit desiccation tolerance. Invertebrates undergoing anhydrobiosis often contract into a smaller shape and some proceed to form a sugar called trehalose. Desiccation tolerance in plants is associated with the production of another sugar, sucrose. These sugars are thought to protect the organism from desiccation damage, and studies have shown that anhydrobiotic organisms can survive for decades in the dry state. In some creatures, such as bdelloid rotifers, no trehalose has been found, which has led scientists to propose other mechanisms of anhydrobiosis. As of 2004, a new application of anhydrobiosis is being applied to vaccines. The process allows some organisms to survive dried-up by replacing water with a sugar solution that keeps cells in a state of suspended animation until rehydration occurs. In vaccines, the process can produce a dry vaccine that reactivates once it is injected into the body. In theory, dry-vaccine technology could be used on any vaccine, including live vaccines such as the one for measles. It could also potentially be adapted to allow a vaccine's slow release, eliminating the need for boosters. This proposes to eliminate the need for refrigerating vaccines, thus making dry vaccines more widely available throughout the developing world where refrigeration, electricity, and proper storage are less accessible.
Anoxybiosis isn't considered a form of cryptobiosis by some. It takes place in situations lacking oxygen, and involves the organism intaking water and becoming turgid and immobile. Studies of the survival rates of organisms during anoxybiosis have given conflicting results.
The cryptobiotic response to high levels of environmental toxins.
Cryobiosis is a form of cryptobiosis that takes place in reaction to decreased temperature. To initiate cryobiosis, the organism freezes all of the water within its cells. This allows the organism to endure the freezing temperatures until more hospitable conditions return.
Osmobiosis is the least studied of all types of cryptobiosis. Osmobiosis occurs in response to increased solute concentration in the solution the organism lives in. Little is known for certain, other than that osmobiosis appears to involve a cessation of metabolism.
@Cignusmisalkan cuma 1 dari 5,5 milyar orang yang bisa demikian, menurut konsensus, angka sekecil itu tidak bisa diterima sebagai kebenaran ilmiah. Kalau Anda terbiasa dengan angka statistik Anda tentu tau hal itu.
Saya kan bilang makhluk hidup hanya bisa dibilang dalam keadaan hidup maka ia harus menyadap energi bebas dari lingkungan. Misalkan jika dalam bentuk spora atau makhluk hidup yang mengalami cryptobiosis seperti yang dikatakan bung bio2, dalam keadaan dormant nya, ia tidak tergolong "hidup" kan?Ia baru bisa "hidup kembali" setelah kondisi lingkungan kondusif untuk melangsungkan kehidupan.