3,301 research outputs found
(13(3):51-56)酸桔葉片殊形潰瘍病斑之利用
No full textCitrus canker caused by Xanthomonas citri (Hasse) Dowson is normally charac-terized by corky, hard, and somewhat suberized lesions surrounded by a yellowish halo on the infected leaves of susceptible varieties. If the canker lesion has developed quickly under extremely favorable conditions, the white spongy tissue will excruded in some degree, and accumulated on the lesions. This special canker lesions with spongy eruption of tissue will be found, sometime, when artificial inoculation was made by overstaying the inoculated plant in pot (Fig. 4) in the inoculation chamber for three or four days after inoculation. It is also easy to induce special lesions by keeping the leaves of susceptible varieties in such a semi-vivo condition as in the moistened Petri-dish (Fig. 3) placed in the incubator for five or six days after inoculation.
The present author was deeply interested in the formation of this special lesion and had made his attempt to utilize them for several purposes, such as screen test for canker-control bactericides, identrfication of newly isolated canker organism, and determination of resistance of citrus varieties to the disease. The present report was made in deal with utilization of this inoculation technique for testing inhibiting effectiveness of the bactericides on the fomation of canker lesion.
柑桔類潰瘍病於極度適宜之環境下所發生之病斑，因罹病組識之海棉細胞受病原菌之刺激致呈畸形膨大，多量溢出，而形成白色隆起之明顯殊形病斑，此種殊形病斑頗易由人工接種而顯現。將酸桔半成熟葉片採下，以自來水沖洗後以解剖針輕刺一定數目之傷痍，浸漬於病原菌懸浮液，使葉面餘液陰乾後排放於潮濕培養皿之玻璃支架上，置28℃定溫箱培養六天，即可於傷痍部位呈現明顯之殊形潰瘍病斑。
筆者以此病斑形成之明顯與容易，乃探測其利用價值。本試驗以五種抗生製劑供作傷痍葉片人工接種後作藥劑侵漬處理，以葉片病斑發生數目，測定供試藥劑對病原菌之抑制或殺減效力。據試驗結果，病斑之發生與藥劑濃度具有規律之相關關係。筆者認為此法於藥劑試驗之初步選定上，為一簡便而可行之方法
UJI EFEKTIFITAS Sargassum ilicifolium T.C. Agardh SEBAGAI PENGHAMBAT PERTUMBUHAN GULMA ALANG-ALANG (Imperata cylindrical (L.) Beauv
No full textPenelitian mengenai ???Uji efektifitas Sargassum ilicifolium T.C. Agardh sebagai penghambat pertumbuhan gulma alang-alang (Imperata cylindrical (L.) Beauv telah dilakukan di Laboratorium Botani, Jurusan Biologi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Hasanuddin, Makassar. Penelitian ini bertujuan untuk mengetahui konsentrasi dari ekstrak Sargassum ilicifolium T.C. Agardh yang efektif dan efisien dalam menghambat pertumbuhan gulma alang-alang (Imperata cylindrical (L.). Penelitian menggunakan 20%, 40%, 60%, dan 100% sebagai control positif, serta tanpa perlakuan ekstrak Sargassum ilicifolium T.C. Agardh sebagai control negatif. Paramenter yang diamati meliputi persentase kematian tanaman, tinggi tanaman, panjang akar, panjang rhizome, dan biomassa alang-alang (Imperata cylindrical (L.). penelitian ini menggunakan Rancangan Acak Lengkap (RAL) dan dilanjutkan dengan Uji Tukey atau Uji Beda Nyata Jujur (BNJ) pada taraf 5%. Hasil penelitian menunjukkan bahwa ekstrak Sargassum ilicifolium T.C. Agardh dapat menghambat pertumbuhan gulma alang-alang (Imperata cylindrical (L.). konsentrasi yang efektif dan efisien yang digunakan adalah konsentrasi 20%
ADP-ribosylation-like factor-6 interacting protein is required for neural crest development in zebrafish embryos
No full textT.C. Powers, '25, author of the book, "Leakage: The Bleeding of the American Economy"
No full textIncludes letters from the American Society for Testing Material about T.C. PowersBlack and WhitePeople: Powers, T.C
Structure and stimulated emission of a high-quality zinc oxide epilayer grown by atomic layer deposition on the sapphire substrate
No full textEGF-induced phenotypic modulation of vascular smooth muscle cells through the regulation of nestin expression
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