How to use ‘a first’ in a sentence

Are you looking for sentences with ‘a first’? See these examples of use.

We investigated the species diversity and habitat use of rodents in the Ifugao Rice Terraces (IRT), Luzon, Philippines, as a first step in their assessment either as pest species of rice or as potential non-target species of rodent control…

… novel kind of stimulus derived from the Gabor elementary functions was used as test signal. A first set of stimuli with a constant relative spatial frequency bandwidth was used to probe the existence of either one or more than one spatial…

… protons on their way from the lumen through CF 0 into the medium. A first treatment with EDTA removed up to 12 % of total CF 1 without increasing the proton permeability of the membranes. A second treatment removed a further 20 % of CF 1…

Surveillance Epidemiology and End Results (SEER) database, who had been diagnosed with breast cancer. Observed numbers of subsequent cancers in the SEER database with a first breast cancer diagnosed from 1973 to 2000 were compared with the…

We investigated the perception of illumination direction in images of 3 -D convex objects under variations of light field and surface material properties. In a first experiment, we used an illumination-matching procedure in order to…

… recaptured in Spain between 1933 and 2005. The results showed that post–breeding movements in Garraf occur in two waves: a first wave that occurs around 10 VIII and is mainly composed of non–sexually active yearlings that do not correspond…

We investigated the motion perception of an occluding contour by an active observer. The task of the observer was to decide whether the occluding contour of an object was a sharp edge in depth, or else belonged to a smooth surface. In a

We investigated the motion perception of an occluding contour by an active observer. The task of the observer was to decide whether the occluding contour of an object was a sharp edge in depth, or else belonged to a smooth surface. In a

We investigated the mass sensitivity of Love mode SAW biosensors by experimental and theoretical techniques. A first experimental approach is based on the analysis of the dispersion curve of the sensor, which helps to determine by…

… recovery period. The kinetics of these non-protein thiol compounds pointed to a rapid cellular response to environmental mercury pollution. After a first decrease, the molar ratio of PC-SH (sulfhydryl in PCs) to intracellular Hg increased…

… 1 β-sensitivity depends on the level of ICE gene expression, which is regulated by the level of endogenous sIL- 1 ra expression. This is a first report on the intracellular function of sIL- 1 ra and these findings may provide key insights into the mechanism underlying the viability of cancer cells. © 1999 Cancer Research Campaig…

… deterioration of previously normal renal function. Advanced ARF at presentation (51 of the 311 with ARF) was defined as a first recorded serum creatinine ^ 500 (imol/l. Patients were classified into low-, medium- and high-risk groups according…

… first-ever strokes occurring within the study time interval were included, and diagnoses were based on specified criteria. We found 138 subjects who had experienced a first stroke over 73 488 person-years; the average incidence rate (new cases…

… no experimental data are available for µs as well as for the strange electric vector form factor, theoretical predictions are helpful to obtain some suggestions for these quantities. A first estimate of the matrix element of the strange…

… ultrasound for the glioma in 5 -ALA administered tumor-bearing mice by inducing apoptotic change of tumor cells. This is a first report to elucidate the feasibility of therapeutic use of 25 kHz, relatively low frequency, ultrasound in…

We investigated the feasibility of residual stress assessment based on Hall coefficient measurements in precipitation hardened IN 718 nickel-base superalloy. As a first step, we studied the influence of microstructural variations on the…

We investigated the feasibility of quantum-correlation measurements in nuclear physics experiments. In a first approach, we measured spin correlations of singlet-spin (1 S 0) proton pairs, which were generated in 1 H(d, 2 He) and 12 C(d, 2…

… evidence of them avoiding Bt containing prey, which means exposure in the field could occur. The presented protocols are a first step towards ecological risk assessment for carabid beetles…

We investigated the effects of partial rootzone drying (PRD) and rootstock vigor on water relations, vegetative and productive performance of ‘Pink Lady’ apple (Malus domestica Borkh.) trees in central Sicily. In a first field trial, trees…

… vection induction have not been studied at all despite their importance in realistic perception of a scene. As a first step toward understanding the effects of surface qualities on vection, we investigated surface qualities derived from…

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