1,721,122 research outputs found
FIGURE 1 in Preliminary Study of the Bumble Bee Bombus griseocollis, Its Eggs, Their Eclosion, and Its Larval Instars and Pupae (Apoidea: Apidae: Bombini)
No full textFIGURE 1. Microphotograph of egg of Bombus griseocollis, anterior end at right.Published as part of <i>Rozen, Jerome G., Smith, Corey Shepard & Johnson, Dennis E., 2018, American Museum Novitates 2018 (3898)</i> on page 1, DOI: 10.1206/3898.1, <a href="http://zenodo.org/record/10110474">http://zenodo.org/record/10110474</a>
FIGURES 31–33 in Preliminary Study of the Bumble Bee Bombus griseocollis, Its Eggs, Their Eclosion, and Its Larval Instars and Pupae (Apoidea: Apidae: Bombini)
No full textFIGURES 31–33. Microphotographs of front of head of Bombus griseocollis showing variation in clypeal pigmentation.Published as part of <i>Rozen, Jerome G., Smith, Corey Shepard & Johnson, Dennis E., 2018, American Museum Novitates 2018 (3898)</i> on page 1, DOI: 10.1206/3898.1, <a href="http://zenodo.org/record/10110474">http://zenodo.org/record/10110474</a>
Multiple forms of endocytosis in bovine adrenal chromaffin cells
Full text linkWe studied endocytosis in chromaffin cells with both perforated patch and whole cell configurations of the patch clamp technique using cell capacitance measurements in combination with amperometric catecholamine detection. We found that chromaffin cells exhibit two relatively rapid, kinetically distinct forms of stimulus-coupled endocytosis. A more prevalent “compensatory” retrieval occurs reproducibly after stimulation, recovering an approximately equivalent amount of membrane as added through the immediately preceding exocytosis. Membrane is retrieved through compensatory endocytosis at an initial rate of ∼6 fF/s. Compensatory endocytotic activity vanishes within a few minutes in the whole cell configuration. A second form of triggered membrane retrieval, termed “excess” retrieval, occurs only above a certain stimulus threshold and proceeds at a faster initial rate of ∼248 fF/s. It typically undershoots the capacitance value preceding the stimulus, and its magnitude has no clear relationship to the amount of membrane added through the immediately preceding exocytotic event. Excess endocytotic activity persists in the whole cell configuration. Thus, two kinetically distinct forms of endocytosis coexist in intact cells during perforated patch recording. Both are fast enough to retrieve membrane after exocytosis within a few seconds. We argue that the slower one, termed compensatory endocytosis, exhibits properties that make it the most likely mechanism for membrane recycling during normal secretory activity
FIGURES 34–36 in Preliminary Study of the Bumble Bee Bombus griseocollis, Its Eggs, Their Eclosion, and Its Larval Instars and Pupae (Apoidea: Apidae: Bombini)
No full textFIGURES 34–36. Microphotographs of right mandible of fifth larval instar of Bombus griseocollis dorsal, inner, and ventral, and outer views, respectively (arrows pointing to setae in outer view).Published as part of <i>Rozen, Jerome G., Smith, Corey Shepard & Johnson, Dennis E., 2018, American Museum Novitates 2018 (3898)</i> on page 1, DOI: 10.1206/3898.1, <a href="http://zenodo.org/record/10110474">http://zenodo.org/record/10110474</a>
FIGURES 28–30 in Preliminary Study of the Bumble Bee Bombus griseocollis, Its Eggs, Their Eclosion, and Its Larval Instars and Pupae (Apoidea: Apidae: Bombini)
No full textFIGURES 28–30. SEM micrographs of tops of pro-, meso- and metathorax, respectively of fifth larval instar of Bombus griseocollis showing left tubercles (arrows) of paired dorsal tubercles on caudal annulets, lateral view.Published as part of <i>Rozen, Jerome G., Smith, Corey Shepard & Johnson, Dennis E., 2018, American Museum Novitates 2018 (3898)</i> on page 1, DOI: 10.1206/3898.1, <a href="http://zenodo.org/record/10110474">http://zenodo.org/record/10110474</a>
FIGURE 12–17 in Preliminary Study of the Bumble Bee Bombus griseocollis, Its Eggs, Their Eclosion, and Its Larval Instars and Pupae (Apoidea: Apidae: Bombini)
No full textFIGURE 12–17. SEM micrographs of micropylar areas on other eggs of Bombus griseocollis showing variation in radiating channels and in apparent number of openings.Published as part of <i>Rozen, Jerome G., Smith, Corey Shepard & Johnson, Dennis E., 2018, American Museum Novitates 2018 (3898)</i> on page 1, DOI: 10.1206/3898.1, <a href="http://zenodo.org/record/10110474">http://zenodo.org/record/10110474</a>
Developmental Biology among Corbiculate Bees: Bombus impatiens, Including Observations on Its Egg Eclosion
No full textRozen, Jerome G., Smith, Corey Shepard, Kocher, Sarah, Wyman, Eli S. (2018): Developmental Biology among Corbiculate Bees: Bombus impatiens, Including Observations on Its Egg Eclosion. American Museum Novitates 2018 (3912): 1-25, DOI: 10.1206/3912.1, URL: https://bioone.org/journals/american-museum-novitates/volume-2018/issue-3912/3912.1/Developmental-Biology-among-Corbiculate-Bees--Bombus-impatiens-Including-Observations/10.1206/3912.1.ful
FIGURE 40 in Preliminary Study of the Bumble Bee Bombus griseocollis, Its Eggs, Their Eclosion, and Its Larval Instars and Pupae (Apoidea: Apidae: Bombini)
No full textFIGURE 40. Microphotograph of cleared abdominal segment of fourth larval instar of Bombus griseocollis, anterior end right, with long, tapering, posteroventrad directed spicules of lower surface of lateral body swelling above and much smaller, denser ventral body spicules below.Published as part of <i>Rozen, Jerome G., Smith, Corey Shepard & Johnson, Dennis E., 2018, American Museum Novitates 2018 (3898)</i> on page 1, DOI: 10.1206/3898.1, <a href="http://zenodo.org/record/10110474">http://zenodo.org/record/10110474</a>
FIGURES 2–4 in Preliminary Study of the Bumble Bee Bombus griseocollis, Its Eggs, Their Eclosion, and Its Larval Instars and Pupae (Apoidea: Apidae: Bombini)
No full textFIGURES 2–4. SEM micrographs of egg of Bombus griseocollis. 2. Entire egg (anterior end up left) demonstrating smooth transparent chorion at short anterior and posterior ends and long stretch of reticulate, rough chorion in the middle. 3. Close-up of anterior end showing the small elevation of the micropyle located centrally. 4. Close-up of the micropyle elevation, with some micropylar opening visible along upper periphery.Published as part of <i>Rozen, Jerome G., Smith, Corey Shepard & Johnson, Dennis E., 2018, American Museum Novitates 2018 (3898)</i> on page 1, DOI: 10.1206/3898.1, <a href="http://zenodo.org/record/10110474">http://zenodo.org/record/10110474</a>
FIGURES 5–7 in Preliminary Study of the Bumble Bee Bombus griseocollis, Its Eggs, Their Eclosion, and Its Larval Instars and Pupae (Apoidea: Apidae: Bombini)
No full textFIGURES 5–7. SEM micrographs of another egg of Bombus griseocollis. 5. Entire egg (anterior end left), again with micropyle centered in middle of front end. 6. Close-up of elevation. 7. Further close-up, demonstrating large number of possible openings.Published as part of <i>Rozen, Jerome G., Smith, Corey Shepard & Johnson, Dennis E., 2018, American Museum Novitates 2018 (3898)</i> on page 1, DOI: 10.1206/3898.1, <a href="http://zenodo.org/record/10110474">http://zenodo.org/record/10110474</a>
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