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Biomedical subjects

J A Hoffmann

Publications and source records attributed to J A Hoffmann.

At least 127 records · Page 7Linked to original sources
PubMed1975

Encapsulation of implanted foreign bodies by hemocytes in Locusta migratoria and Melolontha melolontha.

Sterile fragments of cellophane, cat-gut, cotton, or beef muscle implanted into the body cavity of Locusta migratoria and Melolontha melolontha are immediately surrounded by granular hemocytes which form a multi-layered capsule around each foreign body. The cytoplasm of the granular hemocytes of the outer zone of the capsule in both species shows an accumulation of fibrous material (microtubules and microfilaments). None of the implanted material appeared to be degraded.

Animals↗
PubMed1975

[The hemolymphatic transport of molting hormone during the development of Locusta migratoria L].

Shortly after injection of radio-labelled ecdysone into fifth instar larvae of Locusta migratoria, 20-hydroxy-ecdysone (ecdysterone) is the main hormone found in the blood. Some 10% of the circulating hormone are bound to hemolymph macromolecules. The ratio of bound to free hormone is stage-dependent; it decreases considerably after previous injections of non-labelled ecdysone, but increases in insects in which ecdysone biosynthesis has been blocked by extirpation of the prothoracic glands or selective X-ray treatment of the hemocytopoietic tissue.

Age Factors↗