Previous studies have demonstrated that ovulatory female goldfish release a variety of sex steroids into the water where they function as a pheromonal blend dominated by C 21 steroids that stimulates male hormone release, sperm production and behavior. This study investigated whether male goldfish might...
A Japanese adult male voxel (volume pixel) phantom (hereinafter referred to as the JM phantom) was constructed on the basis of CT images of a healthy Japanese adult male volunteer. Body characteristics of the JM phantom were compared with those of a voxelised MIRD5 type phantom and a Japane...
—Male gonopores on most hermit crabs (Paguroidea) occur as circular or oval ap- ertures on the coxae of the fifth pereopods, are flush with the surrounding coxal segment, may be covered by a membrane or a calcified operculum, and are normally associated with numerous com- plex setae. ...
Why and how sexual reproduction is maintained in natural populations, the so-called "queen of problems", is a key unanswered question in evolutionary biology. Recent efforts to solve the problem of sex have tended to emphasize results generated from laboratory settings and traditional model systems....
In-depth analysis of the proteomes by liquid chromatography-tandem mass spectrometry identified 1244 and 1387 proteins in mature male and female gametocytes, respectively. GFP-tagging of nine selected proteins confirmed their sex-partitions to be agreeable with the results from the proteomic analysis. ...
Twenty-two examples of spawning of mature stream resident males vs.lake run males of the Miyabe charr, Salvelinus malma miyabei, were observed under natural conditions in an inlet stream of Shikaribetsu Lake, Hokkaido, Japan.During spawnings of pairs of lake run type charrs, two types of beha...
This is in contrast to female-biased genes that are much more conserved and are mainly activated during late developmental stages. The high frequency of unique sequences would indicate that male-biased genes evolve more rapidly than the rest of the genome. This finding is particularly intriguing ...
Bloodsamplesweretakenfromfourteensexuallymature(ripe)maleAtlanticsalmon(Salmosalar),eightfromtheacidicWestfieldriver(pH47)andsixfromthelessacidic(pH56)MedwayrivertodetermineifthereisanydifferenceinsexhormoneproductioninthefishinthetworiversTheplasmalevelsofthetwoprincipalmalesexhormones,testosteroneand11-ketotestosterone...
Dynamics of excretion of 17alpha,20beta-dihydroxy-4-pregnen-3-one 20-sulphate, and of the glucuronides of testosterone and 17beta-oestradiol, by urine of reproductively mature male and female rainbow trout (Oncorhynchus mykiss) 来自 AGRIS 喜欢 0 阅读量: 29 作者: AP Scott 关键词: ...
(It takes humans about twenty years to mature and be ready to reproduce. And, remember, only twenty years ago, for most people outside of the military and scientific circles, there was no such thing as the Internet or cell phones.) In other words, we still have the same evolved ...