The fine structure of the normal and wingless chick limb bud was examined with scanning and transmission electron microscopy. The apical ectodermal ridge (AER) of the normal limb bud was composed of pseudostratined columnar cells. These cells contained gap junctions, electron-dense vesicles, and numerous microtubules and microfilaments that were oriented perpendicularly to the basal lamina. Mic...

Ecophysiological models predicting timing of bud burst were tested with data gathered from 40-year-old Norway spruce (Picea abies (L.) Karst.) trees growing in northern Sweden in whole-tree chambers under climatic conditions predicted to prevail in 2100. Norway spruce trees, with heights between 5 and 7 m, were enclosed in individual chambers that provided a factorial combination of ambient (36...

Herpesviruses are unusual among enveloped viruses because they bud twice yet acquire a single envelope. They are also the only known viruses that bud into the nuclear envelope. We discovered that the herpesvirus nuclear egress complex could bud membranes without the help of other proteins by forming a coat-like hexagonal scaffold inside the budding membrane. This finding raises the possibility ...

The wing-bud shows zero regulation following removal of a whole slice of the proximal-distal axis from stage 22 or later. Prior to this it is possible that it may show some regulation. Some of the apparent regulation may be explained by the way in which the limb grows. The bud never shows perfect size regulation or morphallaxis. The proximal-distal axis of the bud between shoulder and wrist exp...

Vegetation phenology is affected by climate change and in turn feeds back on climate by affecting the annual carbon uptake by vegetation. To quantify the impact of phenology on terrestrial carbon fluxes, we calibrate a bud-burst model and embed it in the Sheffield Dynamic Global Vegetation Model (SDGVM) in order to perform carbon budget calculations. Bud-burst dates derived from the VEGETATION ...

John Chant toward the bud orient the nucleus and spindle for mitosis Figure 1 illustrates the key point that, once a yeast cell has initiated a bud early in the cell cycle, it has Cambridge, Massachusetts 02138 committed to its cleavage plane. The molecular manifestation of commitment is the formation of a ring of septin proteins (Cdc3p, Cdc10p, Cdc11p, and Cdc12p) be-For one cell to divide int...

Two regions of the chick limb bud--the apical ectodermal ridge and the zone of polarizing activity--have been shown to influence cell division and pattern formation during normal development and following surgical manipulation. In this study, using a simple coculture system, together with autoradiography, we have shown that these morphogenetically active regions of the limb bud can stimulate qu...

This study aims to determine the influence of location buds and mechanical treatment after grafting on growth orange seedlings. The used a Randomized Group Design (RAK), arranged factorially with nine combinations treatments three tests. first factor is budding eye system (P), consisting 3 levels, namely P1: Fourth Budding Eye; P2: Fifth P3: Sixth Eye. second (K) K1: Rootstock Cutting; K2: Rest...

W artykule przedstawiono i poddano analizie zmiany w zakresie przepisów dotycz?cych doko­nywania przez Rad? Ministrów przeniesie? wydatków bud?etowych, które zosta?y wprowadzone zwi?zku z konieczno?ci? przeciwdzia?ania skutkom COVID-19. pierwszej cz??ci opracowania omówiono regulacj? upowa?niaj?c? do zastosowania tego instrumentu przypadku og?oszenia stanu zagro?enia epidemicznego albo epidemii...