In 1874, Fanny Angelina married physician and bacteriologist Walther Hesse, an investigator of air quality and, specifically, air-borne microbes. In the Winter of 1880-81, Hesse became a research student with Koch in Berlin and experienced firsthand the difficulty of growing microbes on gelatine and the other growth media used at the time.
苹果产业已在20多个省份推广种植，从业人员达数千万。延安苹果产业基地县农民经营性收入61%来自苹果，200多万果农依“果”而富。2025年产季天水花牛苹果呈现出“价涨销畅”局面。
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