Contrast-enhanced ultrasound targeted versus conventional ultrasound guided systematic prostate biopsy for the accurate diagnosis of prostate cancer: A meta-analysis.

Background: Conventional transrectal ultrasonography (TRUS) guided prostate biopsy is the standard method for accurate diagnosis of prostate cancer (PCa). However, the limitations of this technique in terms of missed diagnosis cannot be ignored. Based on previous studies, contrast-enhanced ultrasound (CEUS) may be able to more distinctly detect malignant lesions with increased microvessels.

[Effects of sowing times on the spike differentiation of different wheat varieties under the climate of warm winter].

Spike differentiation processes and freezing damage of three wheat varieties were studied by sowing in different stages. The results showed that under the condition of weather changing warm, the time of entering each stage of spike differentiation of wheat of strong spring variety was earlier than that of wheat of spring variety and semi-winter variety. Sowing times had more effects on durative time of the elongation stage, single-prism stage and two-prism stage of the spike differentiation.