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400 results for “Gonad”
Figure 2 in Identification and expression of Dmrt1 and Sox9 during the gonadal differentiation of Rana chensinensis
Figure 2. Nucleotides and deduced amino acids of rcDmrt1. The DM domain is boxed in shaded rectangles, while the male-specific motifs and P/S-rich element are underlined with a solid and dotted line, respectively. Cysteines and histidines that coordinate Zn2+ are aligned as two intertwined binding sites: site I (circles) and site II (boxes). The stop codon is marked by an asterisk.
Figure 1 in Identification and expression of Dmrt1 and Sox9 during the gonadal differentiation of Rana chensinensis
Figure 1. Images of undifferentiated gonads and differentiated testes and ovaries of R. Chensinensis tadpoles. A, Stage 28; B, stage 46, testis; C, stage 46, ovary. Wd, Wolffian duct; Gmc, gonad-mesonephros complex; Pe, perisome; Ki, kidney; Te, testis; Ov, ovary.
Figure 6. rcDmrt1 and rcSox9 in Identification and expression of Dmrt1 and Sox9 during the gonadal differentiation of Rana chensinensis
Figure 6. rcDmrt1 and rcSox9 expression in various tissues of adult R. chensinensis. Upper two panels, RT-PCR using rcDmrt1 and rcSox9 gene-specific primers, respectively; lower panel, control RT-PCR using rpl8 gene-specific primers.
Figure 4 in Identification and expression of Dmrt1 and Sox9 during the gonadal differentiation of Rana chensinensis
Figure 4. The neighbor-joining phylogenetic trees of Dmrt1 and Sox9. Phylogenetic tree was constructed on the basis of alignment of the amino acid sequences of Dmrt1 and Sox9 homologs, showing the evolutionary relationship of rcDmrt1 (A) and rcSox9 (B) with other species of the Dmrt1 and Sox9 family. Numbers at branch nodes are percentages of bootstrap confidence values derived from 2000 replications. GenBank Accession Nos. of various species are shown in Table 2.
Figure 3 in Identification and expression of Dmrt1 and Sox9 during the gonadal differentiation of Rana chensinensis
Figure 3. Nucleotides and deduced amino acids of rcSox9. The HMG-box domain is boxed in shaded rectangles, while the Sox-N domain and PQA-rich element are underlined with a solid and dotted line, respectively. The stop codon is marked by an asterisk.
Figure 2. - Aspect macroscopique des gonades chez P in Dynamique de la reproduction et fécondité de Pagellus acarne (Sparidae) de la région Centre du littoral algérien
Figure 2. - Aspect macroscopique des gonades chez P. acarne: bisexués du groupe I (A), II (B) et III (C), mâle (D) et femelle (E). TO: territoire ovarien; TT: territoire testiculaire. Échelle = 1 cm. [Macroscopic aspects of gonads in P. acarne: bisexuals of group I (A), II (B) and III (C), male (D), female (E). TO: ovarian territory; TT: testicular territory. Scale = 1 cm].
Figure 8 in Reproduction et maturation des gonades de Sardina pilchardus dans le golfe d'Annaba (Nord-Est algérien)
Figure 8. - Représentation histologique des cinq stades de maturité cellulaire des ovaires de Sardina pilchardus. A: Stade I, Immature; B, C: Stade II, Pré-ponte; D: Stade III, Ponte; E: Stade IV, Post-ponte; F: Stade V, Repos sexuel (voir Tab. II). Coloration à l'hémalunéosine. Ov I: ovocyte primaire de phase I; Ov II: ovocyte primaire de phase II; Ov III: ovocyte primaire de phase III; Ov IV: ovocyte primaire de phase IV; Ov V: ovocyte primaire de phase V; N: noyau; il: inclusions lipidique; AT: ovocyte atrétique; Lo: lumière ovarienne; Fol: follicules vides (lacunes poste-ovulatoires). [Histological representation of the five stages of cell maturity of ovaries in S. pilchardus. A: Stage I, Immature; B, C: Stage II, Pre-spawning; D: Stage III, Spawning; E: Stage IV, Post-laying; F: Stage V, Sexual rest (see Tab. II). Staining with haematoxylin-eosin. Ov I: primary oocyte phase I; Ov II: primary oocyte phase II; Ov III: primary oocyte phase III; Ov IV: primary oocyte phase IV; Ov V: primary oocyte phase V; N: nucleus; il: lipid inclusions; AT: atretic oocyte; Lo: ovarian light; Fol: empty follicles (gaps post-ovulatory).
Figure 7 in Reproduction et maturation des gonades de Sardina pilchardus dans le golfe d'Annaba (Nord-Est algérien)
Figure 7. - Relations entre la fécondité absolue et la longueur totale (A), poids des gonades (B), le poids total (C), et poids somatique (D) chez Sardina pilchardus. [Relationships between batch fecundity and total length (A), ovary free weight (B), total weight (C) and somatic weight (D).]
Figure 4 in Reproduction et maturation des gonades de Sardina pilchardus dans le golfe d'Annaba (Nord-Est algérien)
Figure 4. - Variation mensuelle de l'adiposité chez les femelles (A) et chez les mâles (B) de Sardina pilchardus. Les lettres A, B, C, et D indiquent la différence significative entre les moyennes mensuelles et les groupes de moyennes identiques. Moyennes ± écartstypes de la moyenne. [Monthly change of adiposity in females (A) and in males (B). Different letters indicate significant differences between the monthly means and the groups of identical means. Means ± SEM.]
Figure 5 in Reproduction et maturation des gonades de Sardina pilchardus dans le golfe d'Annaba (Nord-Est algérien)
Figure 5. - Variation mensuelle du coefficient de condition K chez les femelles (A) et chez les mâles (B) de Sardina pilchardus. Les lettres A, B, C, D, et E indiquent la différence significative entre les moyennes mensuelles et les groupes de moyennes identiques. Moyennes ± écarts-types de la moyenne. [Monthly change of condition factor K in females (A) and in males (B). Different letters indicate significant differences between the monthly mean and the mean of identical groups. Means ± SEM.]
Figure 6 in Reproduction et maturation des gonades de Sardina pilchardus dans le golfe d'Annaba (Nord-Est algérien)
Figure 6. - Taille de première maturité sexuelle (L50) des Sardina pilchardus chez les femelles (A) et chez les mâles (B). [The size at first maturity (L50) in females (A) and in males (B).]
Figure 2 in Reproduction et maturation des gonades de Sardina pilchardus dans le golfe d'Annaba (Nord-Est algérien)
Figure 2. - Variation mensuelle du RGS chez les femelles (A) et chez les mâles (B) de Sardina pilchardus. Les lettres A, B, C et D indiquent la différence significative entre les moyennes mensuelles et les groupes de moyennes identiques. Moyennes ± écarts-types de la moyenne. [Monthly change of GSI in females (A) and in males (B). Different letters indicate significant differences between the monthly means and the groups of identical means. Means ± SEM.]
Figure 1 in Reproduction et maturation des gonades de Sardina pilchardus dans le golfe d'Annaba (Nord-Est algérien)
Figure 1. - Répartition des sexes de Sardina pilchardus en fonction de la taille. [Sex repartition of S. pilchardus, depending on the size.]
Figure 14 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 14 Chaetodactylus osmiaefemale. TEM. Spermatozoa deposited in spermatheca. (A) Two spermatozoa, each with highly folded lamella (La), chromatin (Ch) and mitochondrial derivatives (md). (B) Spermatozoa similar to (A) in higher magnification. Note location of chromatin (Ch) within deep infolding of dense lamella (La). Variable structure of mitochondrial derivatives (md) is also evident. (C) schematic representation of sperm cell from female spermatheca. Scale bars: A,B – 2 μm, C – 5 μm. Other abbreviations: Ch – threads of chromatin; La – electron-dense lamella; md – mitochondrial derivatives.
Figure 13 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 13 Chaetodactylus osmiaemale. TEM. (A) Late spermatid showing chromatin threads (Ch), dense lamella (La) and elaborate spongy body (SB). Small vesicles of mitochondrial derivatives (md) are present around the spongy body and along the dense lamella; however, larger and more electron-dense mitochondrial derivatives are also present (arrows). Anastomosing tubules of the spongy body are encircled
Figure 12 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 12 Chaetodactylus osmiaemale. TEM. Two consecutive steps in spermiogenesis showing spermatid just after lamella (La) formation
Figure 11 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 11 Chaetodactylus osmiaemale. TEM. (A) Advanced spermatocyte separated with stroma cell (SC) from neighboring spermatocytes. It shows a spongy layer (SpL) and empty spaces in peripheral cytoplasm in which many mitochondrial derivatives (md) are present. Nuage material (asterisks) surrounds the nucleus (n) containing a small, compact nucleolus (nu). (B) Spermatid in an early stage of spermiogenesis embedded in stroma cell (SC). The nucleus is no longer visible and chromatin (Ch) forms fine threads surrounded by foci of electron-dense material (white arrows). Mitochondrial derivatives are multiform, either large with meandering cristae (md) or small and vesicular (black arrow). (C
Figure 10 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 10 Chaetodactylus osmiaemale. TEM. (A) Spermatocyte more advanced than those in Figure 9B, embedded in stroma cell (SC). Note thicker spongy layer (SpL) covering the cell surface, large nucleus (n) and nuage material (asterisks). Peripheral cytoplasm contains many mitochondrial derivatives (md): they are roundish and possess one circular crista. A Golgi body (Gb) is present under the spongy layer neighboring spermatocyte (right bottom). (B) Peripheral parts of two spermatocytes separated by a stroma cell (SC). Compare the thickness
Figure 9 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 9 Chaetodactylus osmiaemale. TEM. (A) Closer view of developing spermatogonium surrounded by a stroma cell (SC). Nucleus (n is roundish and contains a prominent nucleolus (nu). There are a number of ribosomes in the cytoplasm, as well as dispersed mitochondria (m
Figure 8 in Gonads and gametogenesis in Chaetodactylus osmiae (Acariformes: Astigmata: Chaetodactylidae) a parasite of solitary bees
Figure 8 Chaetodactylus osmiaemale, two aspects (A,B) of germarium. TEM. (A) Early spermatogonia assembled in germarium adhere tightly to each other. They possess a large nucleus (n) with prominent, usually central nucleolus (nu) and mitochondria (m) dispersed in the cytoplasm. Nuage material (asterisks) is present in several sites around the nuclei. (B) Early spermatogonia in germarium show features as in (A), whereas developing spermatogonium separated from germarium (right upper corner) is larger, roundish and has a larger nucleus (n') with peripheral nucleolus (nu). Spaces between developing spermatogonium and germarium are filled with a somatic stroma cell (SC). Scale bars A – 2 μm, B – 5 μm.
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