PENGARUH MONOSAKARIDA DAN PENGGUNAAN SUMBER KARBON LOKAL PADA PEMBENTUKAN ERITROMISIN PADA FERMENTASI Streptomyces erythreus (THE INFLUENCE OF MONOSACCHARIDES AND LOCAL CARBON SOURCES ON ERYTHROMYCIN PRODUCTION FROM FERM

ABSTRAK Penelitian ini dilakukan untuk melihat pengaruh beberapa monosakarida pada fermentasi eritromisin dan penggunaan sumber karbon lokal untuk produksi eritromisin dari Streptomyces erytrheus. Dari percobaan diamati pengaruh d-glukosa terhadap pertumbuhan sel dan produksi eritromisin. Pengaruh konsentrasi glukosa terhadap peningkatan produksi eritromisin pada medium A tertinggi pada konsentrasi 10 mg/ml sedangkan analog glukosa (2 deoksi-d-glukosa) tidak mempengaruhi pertumbuhan tetapi menghambat pembentukan antibiotilc. Efek pengharnbatan pembentukan eritromisin terjadi bila ditambahkan pada fase tropofase atau ketika produksi antibiotik belum terbentuk. Tepung kacang lupin dapat digunakan sebagai sumber karbon yang bails untuk produksi eritromisin dengan basil 8,56 mg/m1 cairan fermentasi. Kata kunci : Streptomyces erythreus, eritromisin, monosakarida, analog glukosa, tepung kacang lupi

Poly[[triaqua­(μ3-4-oxidopyridine-2,6-dicarboxyl­ato)terbium(III)] monohydrate]

In the title coordination polymer, {[Tb(C7H2NO5)(H2O)3]·H2O}n, the TbIII atom is eight-coordinated by a tridentate 4-oxidopyridine-2,6-dicarboxyl­ate trianion, two adjacent monodentate anions and three water mol­ecules, forming a distorted bicapped trigonal–prismatic TbNO7 coordination environment. The anions bridge adjacent TbIII ions into double chains. Adjacent chains are further connected into sheets parallel to (10). O—H⋯O hydrogen bonds involving both coordinated and uncoordinated water mol­ecules generate a three-dimensional network

Poly[[tetra-μ3-acetato-hexa-μ2-acetato­diaqua-μ2-oxalato-tetra­lanthanum(III)] dihydrate]

The title compound, {[La4(CH3CO2)10(C2O4)(H2O)2]·2H2O}n, exhibits a two-dimensional layered structure with the oxalate and acetate ligands acting as bridges. The asymmetric unit contains two crystallographically independent lanthanum(III) ions, half of an oxalate ligand, five acetate ligands, one coordinated water mol­ecule and one uncoordinated water mol­ecule. The coordination numbers of the two La ions are 9 and 10. Adjacent layers of the structure, which extend parallel to (100), are linked by O–H⋯O hydrogen bonds and are also held together by van der Waals inter­actions between the CH3 groups of the acetate anions

A New Family of Porous Lanthanide-Containing Coordination Polymers : [ Ln2 (C2O4)3(H2O)6,12H2O] with Ln = La - Yb or Y

International audienceReactions at low temperature in a mixture benzene/water between dimethyloxalate and a lanthanide chloride lead to a family of 3D-coordination polymers with general chemical formula [Ln2(C2O4)3(H2O)6 3 12H2O]¥, where Ln=La-Yb (except Pm) or Y. All these compounds are isostructural to the already described [Er2(C2O4)3(H2O)6 3 12H2O]¥. Their crystal structure can be described as the juxtaposition of channels with hexagonal cross-section. The channels are filled with crystallization water molecules. Their thermal dehydration produces a collapse of the molecular skeleton leading to amorphous compounds.On the opposite, their dehydration by freeze-drying is possible and the twelve crystallization water molecules can be removed without destruction of the molecular skeleton. The porosity of the dehydrated compounds has been estimated by computational methods to 483 m2 g-1. The luminescence properties of the Eu-containing and Tb-containing compounds are also briefly described

An Unprecedented Family of Lanthanide-Containing Coordination Polymers with Highly Tunable Emission Properties.

International audienceReactions in water between mixtures of rare earth ions (Ln )Y, La-Tm, except Pm) and the sodium salt of terephthalic acid lead to an infinite family of isostructural heteropolynuclear coordination polymers. The monophasic character of the synthesized powders as well as the isostructurality of the heteropolynuclear compounds with the previously described mononuclear [Tb2(C8H4O4)3(H2O)4]∞ are ascertained on the basis of the X-ray powder diffraction diagrams. One family of heterodinuclear compounds has been studied in detail, that is, [(La2-xYx)(C8H4O4)3(H2O)4]∞ with 0 e x e 2. This study demonstrates the random character of the spatial distribution of the metallic ions. In order to demonstrate the high modularity of the physical properties, the solid-state luminescent properties of the compounds of general formula [(Eu2-xTbx)(C8H4O4)3(H2O)4]∞ with 0 e x e 2 have been studied and compared to those of the corresponding mixtures of [(Eu2)(C8H4O4)3(H2O)4]∞ and [(Tb2)(C8H4O4)3(H2O)4]∞. In order to confirm the general character of these studies, the compound containing in equal proportions all 13 rare earth ions between La and Tm (except Pm) plus Y has been synthesized and characterized. At last, the solid-state luminescent properties of compounds belonging to the ternary system [(Ce2-x-yEuxTby)(C8H4O4)3(H2O)4]∞ with x + y e 2 are briefly described

The Lanthanide-Containing Cyclohexane-tri-carboxylate Coordination Polymers Re-Investigated.

International audienc