Growing needle

First a mixture of 0.01 mole of each component was dissolved in 30 ml. of water by heating to approximately 60 °C. This solution was then drawn up into a fine capillary (ca. 0.1 mm. in diameter) and seeded with crystalline complex at one end. Under these conditions the growing needle-shaped crystals oriented their long axes parallel to that of the tube. The phenomenon was observed under a microscope (Figure 4). 

Figure 5. Schemdtic of growing needle-shoped, crystdls in copillary tube. One needle outpdces the others ond is first to cross the meniscus bounddry which recedes in opposite direction owing to evop-ordtion...

For the P polymorphic crystals, they assume a spherulitic shape with needle-shaped protrusions radiating from the center. These needle-like protrusions from the center of the crystals are the actual growing sites of the crystals as can be observed under the microscope. The distribution of these needles around the center of the crystal gives the final spherulitic shape of the P polymorphic form. As in the case of the P polymorph, the growing needles of the P polymorph can also be considered as two-dimensional as it is only radiating outward from its own center and upward. From the above considerations, it can be seen that the more commonly observed Avrami exponent of three will be inconsistent with the theoretical considerations for oils and fats nucleation. 

Since diterpene biosynthesis, like monoterpene biosynthesis, is presumed to be compartmentalized within the secretory cells of the resin ducts, only the lower parts of the growing needles where secretory cells are lighly active were ground. 

Bioluminescence in vitro chemosensitivity assays are now used to assess the sensitivity of tumor cells (obtained by surgical or needle biopsy) to different dmgs and combinations of dmgs. Cells are grown in microwell plates in the presence of the dmgs at various concentrations. If the tumor cells are sensitive to the dmg then they do not grow, hence total extracted cellular ATP, measured using the bioluminescence firefly luciferase reaction, is low. This method has been used to optimize therapy for different soHd tumors and for leukemias (306). 

The crystal compositions vary, depending on the transport agent used, from TiB,4,y (Ij) and TiBj <,4 (TeCl4). At process temperatures > 1000°C and with I2, the transport direction is reversed. Crystals grow in the cold zone of the tube, but only microscopic needle-like crystals are obtained. ... 

A needle-like morphology sometimes grows as a minority phase during the electrocrystallization process. This phase is particularly intriguing because it has notably higher Tcs (7.2-11.1 K) that approach the record for cation radical salts. (The subscript H designates the phase with the higher Tc.) To date, this phase has only been identified for six compositions, four of which contain the... 

Medical waste has been a growing concern because of recent incidents of public exposure to discarded blood vials, needles (sharps), empty prescription botdes, and syringes. Medical waste can typically include general refuse, human blood and blood products, cultures and stocks of infectious agents, laboratory animal carcasses, contaminated bedding material, and pathological wastes. 

Another consequence of methamphetamine addiction is increased risk for HIV infection and AIDS, since many meth users inject the drug intravenously and share needles. In fact, illegal drug use is one of the fastest-growing ways HIV is spread to other people. 

Dendrite growth. Solid silver crystal needles grow on the cathode that can lead to arcing, short circuits, and membrane breach. 

The decomposition of tree leaves is not entirely confined to the litter layer on the forest floor. Leaves and needles are invaded by bacteria and fungi even as they grow these microorganisms may be either pathogens or saprophytes. ... 

The zeolites are generally thought of as having three-dimensional rather than sheet or chain structures. The existence of tetrahedral ring linkages that produce chainlike substructures characteristic of the natural zeolitic species found as needles or fibers reinforces the earlier statement fibers can be constructed from any number of basic units that grow in a preferential direction. 

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