Limbah penyamakan kulit merupakan salah satu limbah yang memerlukan pengolahan karena mengandung ion Cr6+ dapat berbahaya bagi lingkungan, terutama laboratorium sebagai tempat pendidikan. Tujuan dari kajian ini adalah untuk mengetahui efektivitas salak dalam mengadsorpsi upaya pengelolaan laboratorium. Alat digunakan mengukur kadar spektrofotometer DR 1900 jenis portable. Metode penelitian adso...

As the demand for food and fiber grew during the past 300 years, because of the Earth’s expanding human population and rising per capita incomes, society met this demand first by increasing the land area under cultivation and later by improving crops so that their yields were higher. Before 1900, land was abundant almost everywhere, and in the United States, new lands were brought into producti...

We investigate books as an indicator of human capital using extraordinary, individual-level data on book ownership and signature literacy for a population German women men between 1610 1900. Although was very high from early date, it associated with literacy, gender, urbanization, wealth in ways inconsistent its having registered economically relevant capital. The people owned were overwhelming...

P. W. Lamberti, A. P. Majtey, A. Borras, M. Casas, and A. Plastino Facultad de Matemática, Astronomía y Física, Universidad Nacional de Córdoba, Ciudad Universitaria, 5000 Córdoba, and CONICET, C.C. 727, La Plata 1900, Argentina Departament de Física and IFISC, Universitat de les Illes Balears, 07122 Palma de Mallorca, Spain Instituto de Física La Plata, Universidad Nacional de La Plata and CON...

Jacques Loeb [5] broadened and corrected his earlier claims concerning artificial parthenogenesis [6] in sea urchins in a series of experiments in 1900. He published these findings, ?Further Experiments on Artificial Parthenogenesis [4] and the Nature of The Process of Fertilization,? in a 1900 issue of The American Journal of Physiology. His new results amended those from earlier experiments h...

The association of early systolic sounds with aortic valve disease has long been recognized (Potain, 1900; Oria's and Braun-Menendez, 1939). The genesis of this sound and indeed the timing in relation to aortic valve opening has been disputed. Some authors (Wolferth and Margolies, 1945; Wiggers, 1949; Minhas and Gasul, 1959) suggest that they occur at the time of aortic valve opening, while oth...

Although early studies in the fields of education and psychology appreciated the value of imagination, little work has been done pertaining to indicators of imagination. This study synthesized early works on imagination done between 1900 and 2011 to clarify its meaning and identify potential indicators. Then, two groups of samples were collected and validated through exploratory factor analysis...

the bedriaga's plate-tailed gecko, teratoscincus bedriagai, nikolsky, 1900 is distributed in the northern and eastern deserts of sistan, iran and the desert regions of southern afghanistan. in this research, the male reproductive cycle of this lizard has been studied from 5 april to 5 august, 2013. totally, 40 adult males were collected by hand at midnight from four adjacent stations in damghan...