NUCLEIC-ACID BINDING DRUGS .2. PROFLAVINE FREE BASE

C13HIIN3.H20 , orthorhombic, Cmc21, a= 14.493 (8), b= 14.675 (8), c= 5.772 (5) A, Din= 1.29 (1), De= 1.298 g cm -3 for Z=4. Equi-inclination Weissenberg intensities, scanned with an automatic densitometer. The structure, solved by direct methods, was refined to R 0.0928 and Rw 0.0910 for 418 reflexions. The ring system is slightly non-planar, and the crystal structure is characterized by a lack of interplanar stacking

9-CHLOROACRIDINE

C~3HsNC1, orthorhombic, P212~2 ~, a = 6.850 (3), b = 11.662 (5), c = 12.705 (5) A, O m = 1.40 (1), D c = 1.393 g cm -3 for Z = 4. Equi-inclination Weissenberg intensities, scanned with an automatic densitometer. The structure, solved by direct methods, refined to R 0.0577 and R w 0.0649 for 1653 reflexions. The crystal structure is characterized by partial stacking of the chromophores, these are slightly non-planar

CRYSTAL-STRUCTURE OF AN ORTHORHOMBIC FORM OF ADENOSINE-5'-MONOPHOSPHATE

Adenosine-Y-phosphate monohydrate was crystallized in the orthorhombic space group P212121, with a=22"997 (2), b=9.406 (1), c=6.599 (1)A,, Z=4. The structure was solved by direct methods and refined to a final Rw of 0.0639 for 1320 significant reflexions measured on an automatic diffractometer. The conformation of the molecule differs significantly from that previously reported for the monoclinic monohydrate [Kraut & Jensen, Acta Cryst. (1963), 16, 79-88]. The sugar conformation, for example, is here C(2)'-endo, and the glycosidic torsion angle has altered by almost 50 °

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ENV-610: EFFECT OF NUTRIENTS ON METHANOTROPHIC OXIDATION ACTIVITY IN BATCH EXPERIMENTAL STUDIES

Methane biofiltration (MBF) has been proposed as an effective and cost efficient method for mitigating methane emissions from anthropogenic sources. Previous MBF studies have successfully demonstrated effective methane oxidation using compost, soil and biodegradable organic materials as the filter medium because they are a natural source of nutrients, organic matter content, and provide adequate space to support microbiological growth. However, these media types will inevitably decompose over time and lose their effectiveness. This study investigates the use of biologically stable media mixtures of lava rock and biochar in batch oxidation studies to determine their ability to support a methanotrophic bacterial population for the oxidation of methane. A screening experiment was performed using an unreplicated 23 factorial design to understand the influence of nutrient content, water holding capacity (WHC), and mixture ratios of lava rock and biochar, by volume, on the methane oxidation rate (MOR). Virtually no activity was observed when 3300 ppm of nitrogen were added to the batches. Methane oxidation activities were only observed when lower nutrient additions were made at 96 ppm of nitrogen with values reaching 2.2 - 2.5 mol/mL∙hr when the WHC was adjusted to 50% regardless of the media composition. Subsequent replicates performed at the lower nitrogen level additions and 30% WHC demonstrated similar MORs. Results demonstrate the supplementation of nutrients to a mixture of lava rock and biochar is possible in supporting a methanotrophic population and that lava rock can be used as a bulking agent

CRYSTAL AND MOLECULAR-STRUCTURE OF 2',3',5'-TRI-O-ACETYL-6-O-(MESITYLENESULPHONYL)GUANOSINE

The structure of a 6-O-mesitylenesulphonyl derivative of 2',3',5'-tri-O-acetylguanosine, C 24 H 29 N50 10 S, has been determined by X-ray diffraction. Crystals are monoclinic, a = 26.370 (4), b = 8.200 (2), c = 17.991 (3) A, fl = 132.77 (4) o. The solution of the structure in space group C2 was not straightforward and is described in detail. Refinement converged at R = 0.110 for 1102 observed reflections. The guanine base displays some deviations from its usual geometry due to the loss of C(6)-O(6) double-bond character. The ribose sugar is C(2')-endo puckered

The clam resources

Che estuaries and backwaters along the coasts of India have immense clam resources which have been traditionally exploited by the coastal people. The clams form the basis of subsistence for the fishermen during seasons when sea fishing is at a low ebb and clam fishing is a regular activity in many coastal regions of Maharashtra, Goa, Karnataka and Kerala on the west coast. Along the east coast, clam fishing is restricted to a few centres such as the Kakinada Bay although, here and there, they are collected for culinary purposes elsewhere. This is an activity where, besides men and women, children participate. Clam marketing is highly localised in centres of collection. Apart from introduction of improved clam-scooping devices, the fishing method of hand-picking has largely remained unchanged over the years

COMPARATIVE ANALYSIS OF STRUCTURAL PARAMETERS OBTAINED BY DIFFRACTOMETER AND SCANNING-DENSITOMETER MEASUREMENTS

The structure of cytosine monohydrate has been redetermined with reflexion data obtained from automatic digital scanning of Weissenberg films. The previous determination with diffractometer data [McClure & Craven, Acta Cryst. (1973), B29, 1234--1238] converged to an R of 0.037, with average estimated standard deviations of 0"002 A and 0"15 ° in derived bond lengths and angles. The photographic data set converged to an R of 0-0672 with e.s.d.'s of 0-004--0-005 A and 0.3-0.4 °. Normal probability plots showed that the positional (and the derived geometric) parameters were very comparable; the vibrational parameters were rather less so, some systematic error being apparent. The overall conclusion from the study is that the two data sets have given essentially the same positional description of the structure