Selektivitas Medium Cystine Tellurite Blood Agar (CTBA) terhadap Beberapa Isolat Bakteri

Cystine tellurite blood agar (CTBA) medium is a selective medium for Corynebacterium diphtheriae culture. The presence of tellurite is a selectivity of this medium to inhibit the others bacteria. Others medium were used as a selective medium for the culture of Corynebacterium diphtheriae were tinsdale and Hoyle medium, but was recommended by the World Health Organization (WHO) were CTBA and hoyle medium. However, information about the selectivity of medium was recommended by WHO is still limited. The aims of study to determine the selectivity of medium against a number of others species bacteria on CTBA. A number of 24 isolates contains of different species Corynebacterium spp and others species were regrown, then all isolates were cultured in CTBA medium, incubated for 24 – 48 haours at 37°C. The growthing of colony in CTBA were observed. The results showed that 7 isolates for Corynebacterium species can grow well on medium CTBA, 5 isolates from different species showed growth in CTBA medium including Staphylococcus aureus, Streptococcus pneumoniae, Enterobacter sakazakii , Klebsiella pneumoniae and Candida albicans. Meanwhile the rest 12 isolates showed no growthing on CTBA medium. Therefore it can be concluded that the selectivity of the CTBA medium has limited capabilitie

Nitrogen loss pathways in anaerobic soils and mitigation approaches through inhibitors - a review

Nitrogen (N) is the largest yield limiting nutrient in rice cropping. Therefore, efficient N fertilizer management is critical for rice production. Nevertheless, the complex nature of N transformation in soils, has led to low N use efficiency. The lower N use efficiency of fertilizers is a result of multiple loss mechanisms such as volatilization and denitrification and it is a major problem in rice system. Low efficiency of N is not only responsible higher cost of crop production, but also a major threat to environmental quality. The use specially formulated form of fertilizer by supplemented with inhibitors have a great prospect to reduce N losses, improve fertilizer N efficiency and produce positive impact to the environment. This review discusses the N losses pathway in anaerobic rice soil, the effectiveness and mechanism of urease inhibitors as well as nitrification inhibitors to minimize the N loss

DASAR-DASAR MIKROBIOLOGI DAN PENERAPANNYA

Mikrobiologi diartikan sebagai ilmu yang mempelajari mikroba atau mikroorganisme yang merupakan salah satu cabang ilmu dari biologi dengan memerlukan ilmu pendukung kimia, fisika, dan biokimia yang isinya menyajikan pengertian dasar tentang sejarah penemuan mikroba, macam-macam mikroba di alam, struktur sel mikroba dan fungsinya, metabolisme mikroba secara umum, pertumbuhan mikroba dan faktor lingkungan, mikrobiologi terapan di bidang lingkungan dan pertanian. Objek kajiannya ialah semua makhluk hidup yang perlu dilihat dengan mikroskop, khususnya bakteri, fungi, alga mikroskopik, protozoa, dan Archaea. Seluruh kajian yang disajikan oleh mikrobiologi ini tersaji dalam buku ini, sehingga buku ini patut dimiliki oleh para pelajar maupun dosen sebagai sumber rujukan materi pembelajaran atau sebagai bahan tugas. Maka dari itu buku ini hadir kehadapan sidang pembaca sebagai bagian dari upaya diskusi sekaligus dalam rangka melengkapi khazanah keilmuan dibidang sains, sehingga buku ini sangat cocok untuk dijadikan bahan acuan bagi kalangan intelektual dilingkungan perguruan tinggi ataupun praktisi yang berkecimpung langsung dibidang sains