共查询到20条相似文献，搜索用时 15 毫秒
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Summary A recently designed interference-filte monochromator system for biological purposes is described (spectral range: 400–800 m). The system contains 6 monochromator units. It operates with projection lamps (500 or 750 W) as sources of radiation. In each unit the optical system of a high-power projector (Prado 500, Leitz) is used. The irradiances which can be obtained with a single interference-filter are rather high: about 1500 ergs/cm2. sec at 412 m, about 14000 ergs/cm2. sec at 613 m. — In addition to the monochromator system the designs of standard-fields of radiation for red and far-red are presented and data are given concerning a sensitive thermopile Multiflex-galvanometer system. The design is compared in principle with the spectrograph (introduction) and more in detail with the interference-filter monochromator system presented byWithrow (1957).Mit 9 Textabbildungen 相似文献
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《Archives of animal nutrition》2013,67(1-6):403-407
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Dr. Oswald Kiermayer 《Planta》1956,47(5):527-531
Zusammenfassung Es wird eine einfache und schnell zu handhabende Arbeitsweise für den Koleoptilzylindertest zur Prüfung von Wuchsstoffen speziell in Verbindung mit papierchromatographischen Untersuchungen beschrieben. Der Test, dessen Auswertung an Hand von Kontaktkopien erfolgt, hat bei Verwendung von Indol-3-essigsaurem Natrium sein Optimum bei einer Konzentration von 10–4% und lieferte sehr hohe Förderungswerte (120,5%).Mit 1 Textabbildung 相似文献
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Hans Joachim Müller Eberhard Hennig 《Archives Of Phytopathology And Plant Protection》2013,46(1):41-48
Regulatory control can prevent further spontaneous introduction of alien pests to Egypt or slow down the rate of spread of several recently introduced plant pests and diseases, limit their damage and/or allow time to develop alternative management strategies. The problem essentially is the impracticability of detecting the pest at its initial infestation site at a sufficiently early stage to have any chance of eradicating it. Pest spread to secondary foci within the country should be blocked through quarantine and certification programmes. Recognizing that zero tolerance requires sampling every unit in the lot, the default strategy is to define an acceptable tolerance limit for each pest sampled. The binomial probability distribution is presented as a base for determining probabilities of detecting various infestation levels as increasing numbers of samples are collected. Such a method saves time, labour and money in the detection and ensures the relative proportional certainty emanating from the inspected sample to the actual matter. However, a zero tolerance is required for the palm weevils. Neither Poisson nor the negative binomial distributions can be applied to such a zero tolerance or for soil sampling size to solely prove that the nematode is absent. Eventually, the tolerance limit must be backed up by sound technical information and consequent judgements for each specific case. Therefore, comprehensive precautions should be implemented for complete protection against pests and diseases as yet not found in Egypt. 相似文献
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J. P. Dudok van Heel 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1931,3(9):302-304
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H. Richter 《TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik》1940,12(4):95-96
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