Results 81 to 90 of about 169,506 (312)

Variation in circulating testosterone during mating predicts reproductive success in a wild songbird.

Frontiers in Ecology and Evolution, 2016
Testosterone is an important sex hormone and mediates reproduction in male vertebrates. There is ample evidence that testosterone coordinates the expression of physiological, morphological and behavioural traits during reproduction and many of these ...
Beate Apfelbeck, Beate Apfelbeck, Heiner Flinks, Wolfgang Goymann   +3 more
doaj   +1 more source

On the stability of Murray's testosterone model [PDF]

arXiv, 2004
We prove the global asymptotic stability of a well-known delayed negative-feedback model of testosterone dynamics, which has been proposed as a model of oscillatory behavior. We establish stability (and hence the impossibility of oscillations) even in the presence of delays of arbitrary length.
arxiv  

A case of hypogonadtropic hypogonadism due to hypophysitis discovered by secondary male infertility

IJU Case Reports, Volume 6, Issue 1, Page 51-53, January 2023., 2023
Introduction The main causes of secondary male infertility are varicocele and aging. It is rarely caused by adult‐onset hypopituitarism. The onset of hypopituitarism is often due to brain tumors, trauma, surgery, or congenital disorders. Case presentation A 29‐year‐old man was admitted to the hospital with complaints of decreased libido and semen ...
Masatoshi Konishi, Yoko Maegawa, Masaru Tani, Toshihisa Asakura, Yujiro Hayashi, Yoichi Kakuta, Koichi Tsutahara, Kazuhiko Komori, Tetsuya Takao   +8 more
wiley   +1 more source

Left–right reversal of the testes within the scrotum: An extremely rare variant of testicular ectopia

IJU Case Reports, Volume 6, Issue 1, Page 56-59, January 2023., 2023
Introduction Testicular ectopia refers to abnormal positioning of testis, which includes a wide variety of variants. An ectopic testis is located off the normal path of male gonadal descent, unlike conventional undescended testis. Case presentation A 37‐year‐old man presented with the complaint of a palpable lesion in the scrotum.
Kenjiro Kishitani, Kenji Yoda, Satoru Taguchi, Hikaru Suyama, Hayato Hoshina, Yoshiyuki Akiyama, Yuta Yamada, Yusuke Sato, Daisuke Yamada, Haruki Kume   +9 more
wiley   +1 more source

The Effect of Testosterone on Cardiovascular Biomarkers in the Testosterone Trials [PDF]

The Journal of Clinical Endocrinology & Metabolism, 2017
Abstract Context Studies of the possible cardiovascular risk of testosterone treatment are inconclusive. Objective To determine the effect of testosterone treatment on cardiovascular biomarkers in older men with low testosterone.
Mohler, Emile R, Ellenberg, Susan S, Lewis, Cora E, Wenger, Nanette K, Budoff, Matthew J, Lewis, Michael R, Barrett-Connor, Elizabeth, Swerdloff, Ronald S, Stephens-Shields, Alisa, Bhasin, Shalender, Cauley, Jane A, Crandall, Jill P, Cunningham, Glenn R, Ensrud, Kristine E, Gill, Thomas M, Matsumoto, Alvin M, Molitch, Mark E, Pahor, Marco, Preston, Peter E, Hou, Xiaoling, Cifelli, Denise, Snyder, Peter J   +21 more
openaire   +4 more sources

Associations Between Low Serum Testosterone and All-Cause Mortality and Infection-Related Hospitalization in Male Hemodialysis Patients: A Prospective Cohort Study

Kidney International Reports, 2017
Infectious diseases are the second highest cause of death in patients on dialysis. In addition, testosterone deficiency or hypogonadism is prevalent in dialysis patients.
Akio Nakashima, Ichiro Ohkido, Keitaro Yokoyama, Aki Mafune, Mitsuyoshi Urashima, Takashi Yokoo   +5 more
doaj   +1 more source

Theoretical frameworks for neuroeconomics of intertemporal choice [PDF]

Journal of Neuroscience, Psychology, and Economics, Vol 2(2), Nov 2009, 75-90, 2011
Intertemporal choice has drawn attention in behavioral economics, econophysics, and neuroeconomics. Recent studies in mainstream economics have mainly focused on inconsistency in intertemporal choice (dynamic inconsistency); while impulsivity/impatience in intertemporal choice has been extensively studied in behavioral economics of addiction.
arxiv  

Testosterone and Cholesterol Vasodilation of Rat Aorta Involves L-Type Calcium Channel Inhibition

Advances in Pharmacological Sciences, 2010
Testosterone has rapid nongenomic vasodilator effects which could be involved in protective cardiovascular actions. Several authors suggested specific mechanisms to explain this effect, but this matter was not clarified yet.
E. Álvarez, E. Cairrão, M. Morgado, C. Morais, I. Verde   +4 more
doaj   +1 more source

Partition test and sexual motivation in male mice [PDF]

arXiv, 2007
Theoretical analysis of own and literature investigations of sexual motivation with the use of the partition test [Kudryavtseva, 1987, 1994] in male mice was carried out. It has been shown that appearance of a receptive female in the neighboring compartment of common cage separated by perforated transparent partition produces the enhancement of ...
arxiv  

Sex-Specific Associations of Testosterone With Metabolic Traits

Frontiers in Endocrinology, 2019
Background: Testosterone levels are differentially linked with diabetes risk in men and women: lower testosterone levels in men and higher testosterone levels in women are associated with type 2 diabetes, though, the mechanisms are not fully clear.
Stefan Z. Lutz, Stefan Z. Lutz, Stefan Z. Lutz, Robert Wagner, Robert Wagner, Robert Wagner, Louise Fritsche, Louise Fritsche, Andreas Peter, Andreas Peter, Andreas Peter, Ingo Rettig, Caroline Willmann, Caroline Willmann, Caroline Willmann, Ellen Fehlert, Ellen Fehlert, Ellen Fehlert, Peter Martus, Tilman Todenhöfer, Norbert Stefan, Norbert Stefan, Norbert Stefan, Andreas Fritsche, Andreas Fritsche, Andreas Fritsche, Hans-Ulrich Häring, Hans-Ulrich Häring, Hans-Ulrich Häring, Martin Heni, Martin Heni, Martin Heni   +31 more
doaj   +1 more source