scholarly journals Influence of Urinary Stones on the Composition of a 24-Hour Urine Sample

2003 ◽  
Vol 49 (2) ◽  
pp. 281-285 ◽  
Author(s):  
Norbert Laube ◽  
Michael Pullmann ◽  
Stefan Hergarten ◽  
Albrecht Hesse
Keyword(s):  
Urinary Tract ◽  
Stone Formation ◽  
Urinary Stones ◽  
Urinary Concentration ◽  
Oxalate Concentration ◽  
Depletion Effect ◽  
Order Of Magnitude ◽  
Stone Growth

Abstract Background: It can be assumed that stones in the urinary tract continuously increase in size by incorporating material from urine. Consequently, urine will exhibit depleted concentrations of lithogenic constituents when urinary stones are present in the patient’s urinary tract. Methods: To calculate the influence of the depletion effect, we considered two different models of stone growth. In the first model, the increase in stone size depends only on the urinary concentration of a lithogenic substance; the second model also considers the surface area of the growing stone. The case of only one kidney being affected by stone formation is considered separately. We discuss example calculations involving the formation of calcium oxalate. Results: The calculated depletion effects are of a nonnegligible order of magnitude. Assuming both a measured oxalate concentration of, e.g., 0.37 mmol/L and a reasonable in vivo stone growing rate of 10 mm3/day, a relative underestimation of the real “in situ” oxalate concentration between ∼21% (model 1) and ∼42% (model 2) occurs. The depletion effect increases markedly with increasing stone growth rate. Conclusions: Metabolic status can be evaluated correctly only in patients who have been declared “stone-free”, e.g., after stone removal. Because the expected stone-related depletion effect in most cases is of high clinical relevance, we recommend estimating the effect of the order of magnitude of the depletion on actual urinary composition.

Discrimination between urinary tract tissue and urinary stones by fiber-optic-pulsed photothermal radiometry method in vivo

1991 ◽  
Author(s):  
Yuichiro Daidoh ◽  
Tsunenori Arai ◽  
Akira Suda ◽  
Makoto Kikuchi ◽  
Yukikuni Komine ◽  
...  
Keyword(s):  
Urinary Tract ◽  
Fiber Optic ◽  
Photothermal Radiometry ◽  
Urinary Stones ◽  
Pulsed Photothermal Radiometry

Hydration status affects urea transport across rat urothelia

2011 ◽  
Vol 301 (6) ◽  
pp. F1208-F1217 ◽  
Author(s):  
David A. Spector ◽  
Jie Deng ◽  
Kerry J. Stewart
Keyword(s):  
Urinary Tract ◽  
Urine Volume ◽  
Hydration Status ◽  
Urea Transport ◽  
Urea Nitrogen ◽  
And Storage ◽  
Group Concentration ◽  
Water And Solute Transport

Although mammalian urinary tract epithelium (urothelium) is generally considered impermeable to water and solutes, recent data suggest that urine constituents may be reabsorbed during urinary tract transit and storage. To study water and solute transport across the urothelium in an in vivo rat model, we instilled urine (obtained during various rat hydration conditions) into isolated in situ rat bladders and, after a 1-h dwell, retrieved the urine and measured the differences in urine volume and concentration and total quantity of urine urea nitrogen and creatinine between instilled and retrieved urine in rat groups differing by hydration status. Although urine volume did not change >1.9% in any group, concentration (and quantity) of urine urea nitrogen in retrieved urine fell significantly (indicating reabsorption of urea across bladder urothelia), by a mean of 18% (489 mg/dl, from an instilled 2,658 mg/dl) in rats receiving ad libitum water and by a mean of 39% (2,544 mg/dl, from an instilled 6,204 mg/dl) in water-deprived rats, but did not change (an increase of 15 mg/dl, P = not significant, from an instilled 300 mg/dl) in a water-loaded rat group. Two separate factors affected urea nitrogen reabsorption rates, a urinary factor related to hydration status, likely the concentration of urea nitrogen in the instilled urine, and a bladder factor(s), also dependent on the animal's state of hydration. Urine creatinine was also absorbed during the bladder dwell, and hydration group effects on the concentration and quantity of creatinine reabsorbed were qualitatively similar to the hydration group effect on urea transport. These findings support the notion(s) that urinary constituents may undergo transport across urinary tract epithelia, that such transport may be physiologically regulated, and that urine is modified during transit and storage through the urinary tract.

Benefaction of Herbals in the Management of Urolithiasis

2020 ◽  
Vol 06 ◽  
Author(s):  
Ankit Yadav ◽  
Rina Das ◽  
Dinesh Kumar Mehta ◽  
Yatin
Keyword(s):  
Urinary Tract ◽  
Urinary Tract Obstruction ◽  
Stone Formation ◽  
Herbal Medicines ◽  
Urinary Stone ◽  
Stone Disease ◽  
Urinary Stones ◽  
High Recurrence Rate ◽  
Industrialized Countries ◽  
Forced Return

: Kidney stone formation or Urolithiasis is a common problem over many centuries with no guarantee of effective treatment and, a high recurrence rate. Urolithiasis is precipitation of insoluble and less soluble salt such as Oxalate and Phosphate in the urinary tract causing obstruction in the urethra resulting in renal colic and, hematuria. Approximately, 10-12% of the population in industrialized countries are severely affected by Urinary stones. In, only a few geographical areas is stone disease rare, e.g., in the coastal areas of Japan and Germany. It was believed that, 11% of people in India are suffering from urinary stone problems, and approximately 50% of these cases may lead to severe renal damage. Ultimately it causes severe health issues in terms of urinary tract obstruction, severe pain, and infection that adversely affects the health of individuals. Diuretics and narcotic analgesic like drugs which are used to prevent and cure urolithiasis are not effective in all cases and are costly, give quite common recurrences, risk long term fertility and, other potential side effects are observed. So, humans are forced return to Nature for safe remedies using herbal treatment. A great number of Indian medicinal plants have been investigated in the treatment of urolithiasis, and they have been reported to be safe and effective. In the present review, an effort has been made to highlight such herbal medicines which are potentially effective in the management of urolithiasis.

scholarly journals Ultrastructural details of mammalian chromosome architecture

2019 ◽  
Author(s):  
Nils Krietenstein ◽  
Sameer Abraham ◽  
Sergey V. Venev ◽  
Nezar Abdennur ◽  
Johan Gibcus ◽  
...  
Keyword(s):  
Dynamic Range ◽  
Embryonic Stem ◽  
Ctcf Binding ◽  
Chromosome Architecture ◽  
Genome Wide ◽  
Domain Boundaries ◽  
Order Of Magnitude ◽  
Cis Interaction

ABSTRACTOver the past decade, 3C-related methods, complemented by increasingly detailed microscopic views of the nucleus, have provided unprecedented insights into chromosome folding in vivo. Here, to overcome the resolution limits inherent to the majority of genome-wide chromosome architecture mapping studies, we extend a recently-developed Hi-C variant, Micro-C, to map chromosome architecture at nucleosome resolution in human embryonic stem cells and fibroblasts. Micro-C maps robustly capture well-described features of mammalian chromosome folding including A/B compartment organization, topologically associating domains (TADs), and cis interaction peaks anchored at CTCF binding sites, while also providing a detailed 1-dimensional map of nucleosome positioning and phasing genome-wide. Compared to high-resolution in situ Hi-C, Micro-C exhibits substantially improved signal-to-noise with an order of magnitude greater dynamic range, enabling not only localization of domain boundaries with single-nucleosome accuracy, but also resolving more than 20,000 additional looping interaction peaks in each cell type. Intriguingly, many of these newly-identified peaks are localized along stripe patterns and form transitive grids, consistent with their anchors being pause sites impeding the process of cohesin-dependent loop extrusion. Together, our analyses provide the highest resolution maps of chromosome folding in human cells to date, and provide a valuable resource for studies of chromosome folding mechanisms.

In vitro and in vivo polysaccharides assembly: ultrastructural and cytochemical study of growing plant cell wall components.

1978 ◽  
Vol 36 (2) ◽  
pp. 434-435
Author(s):  
D. Reis ◽  
B. Vian ◽  
J. C. Roland
Keyword(s):  
Cell Wall ◽  
Self Assembly ◽  
Plant Cell Wall ◽  
Higher Plants ◽  
Three Dimensional ◽  
Cytochemical Study ◽  
Wall Components

Wall morphogenesis in higher plants is a problem still open to controversy. Until now the possibility of a transmembrane control and the involvement of microtubules were mostly envisaged. Self-assembly processes have been observed in the case of walls of Chlamydomonas and bacteria. Spontaneous gelling interactions between xanthan and galactomannan from Ceratonia have been analyzed very recently. The present work provides indications that some processes of spontaneous aggregation could occur in higher plants during the formation and expansion of cell wall.Observations were performed on hypocotyl of mung bean (Phaseolus aureus) for which growth characteristics and wall composition have been previously defined.In situ, the walls of actively growing cells (primary walls) show an ordered three-dimensional organization (fig. 1). The wall is typically polylamellate with multifibrillar layers alternately transverse and longitudinal. Between these layers intermediate strata exist in which the orientation of microfibrils progressively rotates. Thus a progressive change in the morphogenetic activity occurs.

Three-Dimensional Subcellular Organization of Hepatocytes in Intact Liver: Simultaneous Visualization of Cytoskeletal and Membrane Markers by Confocal Microscopy

1996 ◽  
Vol 54 ◽  
pp. 288-289
Author(s):  
Greg V. Martin ◽  
Ann L. Hubbard
Keyword(s):  
Three Dimensional ◽  
Integral Membrane Proteins ◽  
Polarized Secretion ◽  
Microscope Images ◽  
Computer Aided ◽  
Intracellular Organelles ◽  
Cytoskeletal Elements ◽  
Simultaneous Visualization

The microtubule (MT) cytoskeleton is necessary for many of the polarized functions of hepatocytes. Among the functions dependent on the MT-based cytoskeleton are polarized secretion of proteins, delivery of endocytosed material to lysosomes, and transcytosis of integral plasma membrane (PM) proteins. Although microtubules have been shown to be crucial to the establishment and maintenance of functional and structural polarization in the hepatocyte, little is known about the architecture of the hepatocyte MT cytoskeleton in vivo, particularly with regard to its relationship to PM domains and membranous organelles. Using an in situ extraction technique that preserves both microtubules and cellular membranes, we have developed a protocol for immunofluorescent co-localization of cytoskeletal elements and integral membrane proteins within 20 µm cryosections of fixed rat liver. Computer-aided 3D reconstruction of multi-spectral confocal microscope images was used to visualize the spatial relationships among the MT cytoskeleton, PM domains and intracellular organelles.

Evaluation of Structure-Controlled Silk Fibroin Coatings for Orthopedic Infection and In-Situ Osteogenesis: In Vitro and In Vivo

2020 ◽  
Author(s):  
Wenhao Zhou ◽  
Teng Zhang ◽  
Jianglong Yan ◽  
QiYao Li ◽  
Panpan Xiong ◽  
...  
Keyword(s):  
Silk Fibroin ◽  
Orthopedic Infection
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