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The effect of photoperiod length on respiration in leaves of Saxifraga cernua L., an arctic herb (1989)

McNULTY, A. K. ; CUMMINS, W. R.

Oxford, UK : Blackwell Publishing Ltd

Plant, cell & environment 12 (1989), S. 0

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ISSN: 1365-3040

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Abstract Rates of oxygen uptake were measured in leaves of Saxifraga cernua which had been exposed to an 18-h photoperiod. These rates were compared to those in plants which had been exposed to continuous light. Rates of total dark respiration and alternative pathway respiration measured at the end of the photoperiod gradually decreased over the initial 3 d of exposure to an 18-h photoperiod. Thereafter, respiratory rates were constant. Rates of total dark respiration and alternative pathway respiration decreased during the 6h dark period. Rates of normal and alternative pathway respiration are equally affected during the dark period. The respiratory rates had reached a new minimum level 3 d after the initiation of a dark period. These results suggest that respiration rates in arctic plants are high because of the long photoperiod in the arctic. The kinetics of photoperiod induced changes in respiration are slow enough to suggest the involvement of the biological clock in setting respiration rates. Indeed, total dark respiration and alternative pathway respiration show a definite circadian rhythm. Free-running experiments show that normal respiration changes much less (has a smaller amplitude of variation) than alternative pathway respiration and that alternative pathway respiration accounts for most of the rhythmicity of respiration.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-3040.1989.tb01634.x

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Fertility considerations in nerve-sparing retroperitoneal lymph-node dissection (1994)

Foster, R. S. ; McNulty, A. ; Rubin, L. R. ; [et al.]

Springer

World journal of urology 12 (1994), S. 136-138

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ISSN: 1433-8726

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Notes: Summary Nerve-sparing retroperitoneal lymph-node dissection (RPLND) maintains the patient's ability to ejaculate postoperatively. However, since testicular cancer patients sometimes have diminished spermatogenesis, questions have been raised as to the advisability of nerve preservation relative to ultimate fertility. Fertility status was assessed in clinical stage A patients by two methods. These included standard semen analysis and a post-RPLND survey. The results show that approximately 75% of nonseminomatous testicular cancer patients who present in clinical stage A have fertility potential as based on semen analysis. Additionally, of those patients responding to the post-RPLND survey who had attempted pregnancy following RPLND, 76% reported attainment of pregnancy. Nerve-sparing RPLND maintains fertility potential in clinical stage I patients; furthermore, this fertility potential appears to be worth preserving as many patients will be capable of impregnating their partners.