Novel antennal lobe substructures revealed in the small hive beetle Aethina tumida

The small hive beetle, Aethina tumida, is an emerging pest of social bee colonies. A. tumida shows a specialized life style for which olfaction seems to play a crucial role. To better understand the olfactory system of the beetle, we used immunohistochemistry and 3-D reconstruction to analyze brain structures, especially the paired antennal lobes (AL), which represent the first integration centers for odor information in the insect brain. The basic neuroarchitecture of the A. tumida brain compares well to the typical beetle and insect brain. In comparison to other insects, the AL are relatively large in relationship to other brain areas, suggesting that olfaction is of major importance for the beetle. The AL of both sexes contain about 70 olfactory glomeruli with no obvious size differences of the glomeruli between sexes. Similar to all other insects including beetles, immunostaining with an antiserum against serotonin revealed a large cell that projects from one AL to the contralateral AL to densely innervate all glomeruli. Immunostaining with an antiserum against tachykinin-related peptides (TKRP) revealed hitherto unknown structures in the AL. Small TKRP-immunoreactive spherical substructures are in both sexes evenly distributed within all glomeruli. The source for these immunoreactive islets is very likely a group of about 80 local AL interneurons. We offer two hypotheses on the function of such structures.

Sedimentology of surface samples from the Weddell Sea, Antarctica

Mineralogical and granulometric properties of glacial-marine surface sediments of the Weddell Sea and adjoining areas were studied in order to decipher spatial variations of provenance and transport paths of terrigenous detritus from Antarctic sources. The silt fraction shows marked spatial differences in quartz contents. In the sand fractions heavy-mineral assemblages display low mineralogical maturity and are dominated by garnet, green hornblende, and various types of clinopyroxene. Cluster analysis yields distinct heavy-mineral assemblages, which can be attributed to specific source rocks of the Antarctic hinterland. The configuration of modern mineralogical provinces in the near-shore regions reflects the geological variety of the adjacent hinterland. In the distal parts of the study area, sand-sized heavy minerals are good tracers of ice-rafting. Granulometric characteristics and the distribution of heavy-mineral provinces reflect maxima of relative and absolute accumulation of ice-rafted detritus in accordance with major iceberg drift tracks in the course of the Weddell Gyre. Fine-grained and coarse-grained sediment fractions may have different origins. In the central Weddell Sea, coarse ice-rafted detritus basically derives from East Antarctic sources, while the fine-fraction is discharged from weak permanent bottom currents and/or episodic turbidity currents and shows affinities to southern Weddell Sea sources. Winnowing of quartz-rich sediments through intense bottom water formation in the southern Weddell Sea provides muddy suspensions enriched in quartz. The influence of quartz-rich suspensions moving within the Weddell Gyre contour current can be traced as far as the continental slope in the northwestern Weddell Sea. In general, the focusing of mud by currents significantly exceeds the relative and absolute contribution of ice-rafted detritus beyond the shelves of the study area.

3D models created from ROV videos and their corresponding subtransect dimensions

Underwater video transects have become a common tool for quantitative analysis of the seafloor. However a major difficulty remains in the accurate determination of the area surveyed as underwater navigation can be unreliable and image scaling does not always compensate for distortions due to perspective and topography. Depending on the camera set-up and available instruments, different methods of surface measurement are applied, which make it difficult to compare data obtained by different vehicles. 3-D modelling of the seafloor based on 2-D video data and a reference scale can be used to compute subtransect dimensions. Focussing on the length of the subtransect, the data obtained from 3-D models created with the software PhotoModeler Scanner are compared with those determined from underwater acoustic positioning (ultra short baseline, USBL) and bottom tracking (Doppler velocity log, DVL). 3-D model building and scaling was successfully conducted on all three tested set-ups and the distortion of the reference scales due to substrate roughness was identified as the main source of imprecision. Acoustic positioning was generally inaccurate and bottom tracking unreliable on rough terrain. Subtransect lengths assessed with PhotoModeler were on average 20% longer than those derived from acoustic positioning due to the higher spatial resolution and the inclusion of slope. On a high relief wall bottom tracking and 3-D modelling yielded similar results. At present, 3-D modelling is the most powerful, albeit the most time-consuming, method for accurate determination of video subtransect dimensions.

Clavier concerti. [music] /

[v.1.] Nr. 1, D moll. Nr. 2, E dur. Nr. 3, D dur. Nr. 4, A dur -- [v.2.] Nr. 5, F moll. Nr. 6, F dur. Nr. 7, G moll.

Hebräische Melodien. [music] : nach Eindrücken der Byronschen Gesänge ; für Viola und Pianoforte, op. 9 /

Nr. 1 C Moll -- Nr. 2 A Moll -- Nr. 3 D Dur.

Quatuors für 2 Violinen, Viola und Violoncell /

Each part paged continuously.

Fundamentals of electronics.

"NAVPERS 93400 A."

Mémoires de duc de Saint-Simon,

Vol. 20: Table analytique rédigée par l'auteur lui-même, et imprimée pour la première fois d'après son manuscrit autographie. 3. éd.; v. 21: Supplément, pub. par A. de Boislisle.

Česká politika /

Each vol. has special t.p. only.

Les Tchécoslovaques, leurs problèmes, leur avenir, nos intérêts communs.

On cover: 3. éd.

La Gaule poétique, ou L'histoire de France considérée dans ses rapports avec la poésie, l'éloquence et les beaux-arts.

Vol. 5-8: 3. éd., rev., cor. et augm. ... Paris, C.F. Patris [etc.] 1819.

L'Espagne et Napoléon.

Vols. 1: 2. éd.; v. 2: 2. éd; v. 3: 3. éd.

Aristotelis, Alexandri, et Cassii Problemata, cum Theophrasteorum quorundam collectaneis. ...

Mode of access: Internet.

Diccionario de medicina y cirugía o Biblioteca manual médico-quirúrgica /

Falta t. 3 (D)

Biblioteca de legislación ultramarina en forma de diccionario alfabético /

Contiene: T. 1: A - T. 2: B-C - T. 3: D-I - T. 4: J-O - T. 5: P-S - T. 6: T-Z.