(a.) Incapable of being penetrated or pierced; not admitting the passage of other bodies; not to be entered; impervious; as, an impenetrable shield.
(a.) Having the property of preventing any other substance from occupying the same space at the same time.
(a.) Inaccessible, as to knowledge, reason, sympathy, etc.; unimpressible; not to be moved by arguments or motives; as, an impenetrable mind, or heart.
Example Sentences:
(1) During the entire process the passage between the lumen and the intercellular space remained blocked by the tight junctions, as shown by their impenetrability to ferritin.
(2) Veering between a patronising video , a vague report and impenetrable financial data does not amount to openness and accountability.
(3) Similar results were obtained with subcutaneous or intraperitoneal thymus grafts and with thymus grafts within cell-impenetrable diffusion chambers.
(4) On the other hand, the performance of a material that is liquid-proof is absolute--it is impenetrable and can be accurately described as impervious.
(5) In a 70-page document that was largely ignored and almost completely impenetrable, he said the US intended to treat cyberspace as a military battleground.
(6) This last phenomenon appears to precede the entry of some axons into the neuropil and suggests that the glia limitans may not necessarily represent an impenetrable barrier to the passage of regenerating axons into the CNS.
(7) It appears that the major part of the exclusion volume is due to the collagen-fibril as a rod and the dextran coil as an impenetrable sphere.
(8) Some of the games are based around recognisable sports (like football), others around ancient samurai conflicts – but whatever the theme, the nature of the action is absolutely impenetrable to the casual onlooker.
(9) Many of the particles could therefore pass freely through tightly woven fabrics with pores up to 10-15 micrometer which might seem to be impenetrable to whole corneocytes, typically larger than 30 X 40 micrometer in the hydrated state.
(10) QSI's intentions are no doubt honest but if players as important as goalkeepers can be owned by anonymous third parties in impenetrable offshore companies the potential for match fixing is clear.
(11) The more complex a system, the more unintelligible and impenetrable is the map of possible side effects.
(12) Spontaneous postoperative expulsion of an IUD resulted in blockage or distortion of the anastomosis in 1 monkey; and in another the anastomosis was patent for a least 5 months, but later became impenetrable.
(13) Lactoperoxidase-catalyzed iodination (LCI) was carried out under impenetrable conditions in intact electroplax (where protein exposure on the external surface is monitored) and in split electroplax (where total protein labeling on both the external and internal monolayers of the plasma membrane bilayer is monitored).
(14) For 45 minutes, Arjen Robben twisted and turned with the ball only to find himself confronted by an impenetrable thicket of blue-shirted Brazil defenders.
(15) And viewed again in this mood, Libeskind's building, with its blank excoriated surfaces, looks closed to understanding; in material as in spirit, impenetrable.
(16) Subsequent chemical analysis of sperm-penetrable and impenetrable samples indicated that the concentrations of mucus nondialyzable solids (NDS), mucins, and soluble proteins were significantly higher in impenetrable specimens.
(17) The mites ate the germ before the endosperm, leaving an impenetrable layer of crushed endosperm cells between these regions.
(18) Two decades after Tutu made it a shining city of defiance amid seemingly impenetrable darkness, Cape Town is finding economic liberation harder than the political kind.
(19) Insensitivities at 190 and 100 nm were common to all five types of spores, indicating that these wavelengths were particularly impenetrant and absorbed by the outer layer materials.
(20) By announcing a huge programme of bond purchases , much bigger relative to the eurozone bond market than the quantitative easing implemented in the United States, Britain, or Japan, the ECB president, Mario Draghi, erected the impenetrable firewall that had long been needed to protect the monetary Union from a Lehman-style financial meltdown.
Impregnable
Definition:
(a.) Not to be stormed, or taken by assault; incapable of being subdued; able to resist attack; unconquerable; as, an impregnable fortress; impregnable virtue.
(a.) Capable of being impregnated, as the egg of an animal, or the ovule of a plant.
Example Sentences:
(1) The results of the study suggest that perhaps tobramycin of cefotaxime-impregnated PMMA beads would produce local levels of antibiotic high enough to sterilize a given dead space for a period of 28 days.
(2) The nerve endings in the heart of fishes were studied using silver impregnation techniques.
(3) The silver impregnated axons of these cells converge to a paired centrosuperficial tract forming terminal enlargements at the ventrolateral surface of the spinal cord.
(4) After fixation by perfusion, perikaryal neurofibrils were not impregnated in either newborn or old animals or in animals with facial nerve transection.
(5) The reason behind Burnham's impregnable new confidence may well also explain the coalition's eagerness to drive him on to the backbenches.
(6) Essential features are the use of reagent grade chemicals only, a pretreatment solution to ensure optimal impregnation of different organs from different animals and species, and an unvarying procedure.
(7) These cells were argyrophil with the silver impregnation method of Grimelius.
(8) In Golgi-Cox-impregnated coronal sections of albino rat brains at 1, 4, 26, 24, 30, 60 and 90 days it is presented the evolution of the spine-less, bare initial zone ("nude zone", NZ) at the proximal apical main dendrites of the layer V pyramidal neurons in the somatosensory and anterior limbie cortex.
(9) The epithelial surface is covered with adherent masses composed of desquamated and destroyed epithelial cells and leukocytes impregnated with proteins and penetrated by pseudomycelium.
(10) The use of cryostat and cryoprotective measures for processing Golgi impregnated brain tissue has shortened and simplified the method without loss of quality.
(11) was measured by the radioactive microsphere method in rats at different time intervals after the implantation of carrageenan-impregnated sponges.
(12) The distribution of neurofilament protein-triplet immunoreactivity also correlated with the distribution of staining observed with a silver impregnation method based on Bielschowsky.
(13) The author examined the basic structural elements of the aortic wall by means of histological and impregnation methods.
(14) SEM and TEM examinations suggested that dentinal collagen exposed by the etching but not entangled and impregnated by poly (4-META-co-MMA) easily deteriorated by water during the longer immersion.
(15) Total and partial meso-diencephalic transections and lesions of the central gray matter were performed to trace with the Fink--Heimer silver impregnation method the ascending brain stem pathways to the forebrain.
(16) By means of HPLC mono- and oligomeric carbohydrates are separated on silica, modified chemically with aminopropyl groups or impregnated in situ with an amine modifier (piperazine).
(17) Ovarian activity was controlled for synchronization of oestrus by using progestagen-impregnated intravaginal sponges and multiple ovulations were induced by using exogenous gonadotrophin therapy.
(18) By utilizing the gamma-emitting isotope of selenium, Se-(8-azidoadenosyl)[75Se]selenomethionine eliminates the need for the impregnation of acrylamide gels with fluorographic enhancers and dilution of liquid samples into scintillation cocktails, as is required with the commonly used methyl-3H-labeled and 35S-labeled S-(8-azidoadenosyl)methionine.
(19) Body mass and food intake increased substantially during pregnancy and lactation and the magnitude of the increase was unaffected by daylength; by contrast, body weight was significantly reduced in non-impregnated voles kept in short as compared to long days.
(20) In silver-impregnated sternocleidomastoid muscles of the young adult rat, we measured synaptic parameters such as nerve terminal length, the number of branching points of terminal arborization, and muscle fiber diameter, and used a morphometric approach to explore specific questions concerning neuromuscular remodelling.