Volume seven of this distinguished series includes reviews of the following topics in photobiology and photochemistry: Electron spin resonance in photosynthetic systems, by E. C. Weaver and H. E. Weaver; Photochrome, a photochromic sensor, by W. Shropshire; Photosynthetic nitrogen fixation by blue-green algae, by M. B. Allen; The role of light in nitrate metabolism in higher plants, by L. Beeve...

The effects of estradiol and progesterone on social recognition were evaluated in a habituation-dishabituation procedure. Ovariectomized female rats were either given 18 microg/kg of estradiol benzoate followed by progesterone, 1 mg/rat, 48 h later or oil. The test consisted of 4 consecutive exposures to a juvenile rat and a final exposure to a novel juvenile. Although the time spent investigat...

In most insects, vitellogenesis is regulated by juvenile hormone (JH). The recent cloning of the vitellogenin gene in a number of JH-dependent species has allowed the study of the induction of vitellogenin production by JH at a molecular scale. Potential JH response elements have been described in the regulatory regions of vitellogenin and other JHinducible genes. These elements may not only sh...

18 Eusocial insect colonies are defined by extreme variation in reproductive activity among 19 castes, but the ancestral conditions from which this variation arose are unknown. 20 Investigating the factors that contribute to variation in reproductive physiology among 21 solitary insects that are closely related to social species can help to fill this gap. We 22 experimentally tested the role of...

Abstract Patterns of juvenile hormone have been intensively studied in the cockroach Blattella germanica under different physiological situations. However, data have been mainly obtained in vitro, and refer to hormone synthesized by isolated corpora allata, whereas information available on hormone concentration in the hemolymph is restricted to adult females. In order to complement our studies ...

Hormone therapy alone or in combination with targeted agents (CDK4/6 inhibitors, alpelisib, everolimus) is currently the standard treatment of metastatic luminal Her2-negative breast cancer. Aromatase inhibitors and fulvestrant are main hormone agents. Fulvestrant belongs to a special class antiestrogens – selective estrogen receptor degraders (SERD) does not have agonist activity, unlike tamox...

The moulting process of insects is governed by the interaction of three hormones: prothoracicotropic hormone (PTTH), juvenile hormone, and ecdysone (see Doane, 1973; Wyatt, 1972; Wigglesworth, 1971 for recent reviews). To initiate the moult the brain releases PTTH which causes the secretion of ecdysone from the prothoracic glands. Ecdysone in turn triggers the detachment of the epidermis from t...

Patterns of juvenile hormone have been intensively studied in the cockroach Blattella germanica under different physiological situations. However, data have been mainly obtained in vitro, and refer to hormone synthesized by isolated corpora allata, whereas information available on hormone concentration in the hemolymph is restricted to adult females. In order to complement our studies in vitro,...

Electrical activity of the brain of Lithobius forficatus has been recorded. The addition of ecdysteroids (moulting hormone) in the haemolymph increased the frequency and amplitude of electrical response. Such a stimulation might be specific to these products since cholesterol and juvenile hormone had no action. The destruction or removal of various parts of the cephalic endocrine system demonst...