Derived horizontal fragmentation is one of the main database distribution design techniques. Unlike primary horizontal fragmentation, the decision of derived horizontal fragmentation is not straightforward. In the literature, in the context of the relational model, derived horizontal fragmentation of a member relation is achieved by performing semijoins with fragments of one of its owner relati...

The utility of surface-induced dissociation (SID) to probe the structure, energetics and fragmentation mechanisms of protonated peptides is discussed and demonstrated. High internal energy deposition provided by low-energy (eV range) ion-surface collisions yields extensive fragmentation of protonated peptides, allowing relatively uncomplicated and rapid sequence analysis of oligopeptides. SID o...

Following the sexual cycle, hypotrichous ciliated protozoans fragment a set of their micronuclear chromosomes to generate the thousands of short, linear DNA molecules present in the transcriptionally active macronucleus. We have used a hybrid selection procedure to examine macronuclear DNA molecules for subtelomeric length heterogeneity to determine whether chromosome fragmentation occurs at un...

Anthropogenic habitat loss and fragmentation have been implicated as among the key drivers of the burgeoning global biodiversity crisis. In response, there is a growing mandate among natural resource managers to evaluate the impacts of proposed management actions on the extent and fragmentation of habitats. Unfortunately, few guidelines exist to help managers understand the many complex issues ...

Context : The minimum mass for star formation is a critical parameter with profound astrophysical, cosmological and anthropic consequences. Aims. Our first aim is to calculate the minimum mass for Primary Fragmentation in a variety of potential star-formation scenarios, i.e. (a) hierarchical fragmentation of a 3-D medium; (b) one-shot, 2-D fragmentation of a shock-compressed layer; (c) fragment...

The rate for Z0 → J/ψ+ l+l− is suprisingly large with about one event for every million Z0 decays. The reason for this is that there is a fragmentation contribution that is not suppressed by a factor of M2 ψ/M 2 Z . In the fragmentation limit MZ → ∞ with Eψ/MZ fixed, the differential decay rate for Z 0 → J/ψ + l+l− factors into electromagnetic decay rates and universal fragmentation functions. ...

Experimental results on c-and b-quark fragmentation are reviewed. The discussion is concentrated on measurements of heavy-quark fragmentation functions and fragmentation fractions. Measurements of various heavy-quark fragmentation ratios are also discussed. The experimental results are compared with theoretical expectations and model predictions.

Background: Micronutrients in support to the carbon cycle were shown to reduce sperm DNA damage both in animal models and infertile men. Besides supporting DNA methylation, their positive effect may be mediated by an improved performance of the endogenous antioxidant system but this has not yet been proven in clinical settings. The present study aimed at evaluating the effects of micronutrient ...

Recent calculations with a two-fluid smoothed particle hydrodynamics (SPH) code of the collapse of a magnetized dense core have found little evidence for fragmentation. These calculations have been interpreted as implying that magnetic braking by magnetic tension forces is sufficient to inhibit fragmentation, contrary to a suggestion by Boss that magnetic fields might encourage fragmentation. H...

In this paper, the effect of fluidized bed temperature on primary fragmentation of Huadian oil shale was investigated experimentally in thermal state using a small-scale fluidized bed with N2 as fluidizing gas. The fluidized-bed temperatures changed from 600 °C to 1000 °C. Experimental results indicate that the fluidized bed temperature is an important factor of primary fragmentation of oil sha...