The enzymatic conversion of serine to glycine and the reverse process have been shown to occur in a variety of avian (l-7), mammalian (8-16), and bacterial (17-20) tissues or tissue extracts. In almost all instances, sensitive tracer techniques, with C14or N16-labeled substrates, have made it possible to study the reaction even though, in many instances, the net conversions were small. It has b...

The principles are discussed of bench terracing and deep tined tillage, on the level contour, appliedto selected shallow soils on steep slopes of the Ifafa area on the Natal south coast. Results from 36 month old timber (Eucalyptus grandis) and [4 month old sugarcane (N16) grown on bench terraces are reported and compared with current practices. The implications of this site-specific technique ...

Genetic maps of Brassica napus were constructed from four segregating populations of doubled haploid lines. Each mapping population had the same male parent and used the same set of RFLP probes, facilitating the construction of a consensus map. Chromosomal rearrangements were identified in each population by molecular marker analysis and were classified as de novo homologous nonreciprocal trans...

An alkaline pectate lyase, Bsp165PelA, was purified to homogeneity from the culture broth of alkaliphilic Bacillus sp. N16-5. The enzyme showed a specific activity as high as 1000 U/mg and had optimum activity at pH 11.5 and 50 degrees . It was composed of a single polypeptide chain with a molecular of 42 kDa deduced from SDS-PAGE, and its isoelectric point was around pH 6.0. It could efficient...

Significant progress has been made in isolating novel alkaline β-mannanases, however, there is a paucity of information concerning the structural basis for alkaline tolerance displayed by these β-mannanases. We report the catalytic domain structure of an industrially important β-mannanase from the alkaliphilic Bacillus sp. N16-5 (BSP165 MAN) at a resolution of 1.6 Å. This enzyme, classified int...

The propensity to imitation over other forms of learning is one of the major differences between humans and other species and one that has allowed for cumulative cultural evolution. However, imitation alone cannot explain increases of average fitness in human populations. Anthropologists have hypothesized that people do not imitate behaviors from random people; rather, transmission of some cult...

Chlamydiae exhibit low interspecies DNA homology and plasmids from different chlamydial species can be readily distinguished by Southern blot analysis and restriction enzyme profiling. In contrast, available plasmid sequence data from within the species Chlamydia trachomatis indicate that plasmids from human isolates are highly conserved. To evaluate the nature and extent of plasmid variation, ...

In Paper I in this series (2) the stimulation of penicillin production by certain compounds containing the phenylacetyl group was reported. It was realized that a stimulation of yield of this biological product following addition of a given substance to the medium may result from any one of several possible metabolic mechanisms. The stimulating substance may act as a vitamin or growth promoter,...

The paper analyzes exchange rate regimes implemented by the major Latin American countries since the Second World War, with special attention on the period of the second globalization process beginning in the 1970s. The analysis follows a historical narrative aiming to provide an understanding of the domestic and external circumstances in which various regimes were adopted. A simple conceptual ...

In this paper, we numerically investigate the effects of surfactant on dropdrop interactions in a 2D shear flow using a coupled level-set and immersed interface approach proposed in (Xu et al., J. Comput. Phys., 212 (2006), 590–616). We find that surfactant plays a critical and nontrivial role in drop-drop interactions. In particular, we find that the minimum distance between the drops is a non...