Semen analysis and fertility prognosis in andrological patients

Holland-Moritz, H.; Krause, Walter

doi:10.1111/j.1365-2605.1992.tb01141.x

Cited by 17 publications

(18 citation statements)

References 16 publications

(11 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lower bcc value is qualitatively consistent with experiments in Fe-and Ni-based systems, where primary nucleation of metastable bcc phases has been observed in rapidly quenched alloys with stable fcc structures [29][30][31][32][33][34][35][36]. The SMT theory was recently employed in calculations of a for a wider variety of compounds, possessing complex ''polytetrahedral" order [37][38][39]. These calculations yield results pointing to an even stronger dependence of a on crystal structure.…”

Section: Magnitudes Of Crystal-melt Interfacial Free Energiessupporting

confidence: 78%

Solidification microstructures and solid-state parallels: Recent developments, future directions

et al. 2009

View full text Add to dashboard Cite

Rapid advances in atomistic and phase-field modeling techniques as well as new experiments have led to major progress in solidification science during the first years of this century. Here we review the most important findings in this technologically important area that impact our quantitative understanding of: (i) key anisotropic properties of the solid-liquid interface that govern solidification pattern evolution, including the solid-liquid interface free energy and the kinetic coefficient; (ii) dendritic solidification at small and large growth rates, with particular emphasis on orientation selection; (iii) regular and irregular eutectic and peritectic microstructures; (iv) effects of convection on microstructure formation; (v) solidification at a high volume fraction of solid and the related formation of pores and hot cracks; and (vi) solid-state transformations as far as they relate to solidification models and techniques. In light of this progress, critical issues that point to directions for future research in both solidification and solid-state transformations are identified.

show abstract

Section: Magnitudes Of Crystal-melt Interfacial Free Energiessupporting

confidence: 78%

Solidification microstructures and solid-state parallels: Recent developments, future directions

et al. 2009

View full text Add to dashboard Cite

show abstract

“…These articles did, however, fi nd a positive correlation between the high proportion of morphologically normal sperms and the increased likelihood of fertility and/or pregnancy. Other articles confi rmed this correlation [26][27][28][29] .…”

Section: Discussionmentioning

confidence: 99%

The Use of Semen Parameters to Identify the Subfertile Male in the General Population

Merwe

Kruger

Oehninger

et al. 2005

Gynecol Obstet Invest

View full text Add to dashboard Cite

Aims: To present a structured review of the literature published on semen parameters and in vivo fertility potential and to establish fertility/subfertility thresholds for sperm morphology using Tygerberg strict criteria, sperm concentration, and sperm motility. Method: The published literature comparing fertile and subfertile populations between 1983 and 2002 was reviewed. Results: A total of 265 articles were identified by the sourcing methodology, but only four articles provided data that could be tabulated and analyzed. Using receiver-operating characteristics curves, morphology proved to be the best predictor of subfertility in 2 of the 4 articles, with concentration and motility also showing good predictive power. The thresholds calculated ranged between 4 and 10% for morphology, between 13.5 × 10⁶/ml and 34 × 10⁶/ml for concentration, and between 32 and 52% for motility. A second set of much lower thresholds was calculated in three of the articles using either a 15 or 50% prevalence of subfertility in the population or the tenth percentile of the fertile population. The adjusted thresholds were between 3 and 5% for morphology, between 9 × 10⁶/ml and 20 × 10⁶/ml for concentration, and between 20 and 30% for motility. Conclusions: Because these lower thresholds have a much higher positive predictive value, we suggest that thresholds of <5% normal sperm morphology, a concentration <15 × 10⁶/ml, and a motility <30% should be used to identify the subfertile male. The lower threshold for morphology also fits in vitro fertilization and intrauterine insemination data calculated previously. Using the parameters in combination increases the clinical value of semen analysis.

show abstract

“…[1][2][3][4][5] Crystalline, quasicrystalline, or amorphous phases that have short-range and medium-range orders that are similar to that of the corresponding liquid structures generally have smaller interfacial free energies between the amorphous and ordered phases. 3,[5][6][7][8] This has been proposed to be an influential factor with rapidly cooled liquid metallic alloys not only for the selective nucleation of certain structures among many competing ones but also for avoiding crystallization to form a glass. Therefore, obtaining a more quantitative description of the structure of liquid metal alloys, in particular in their undercooled state, is important for discriminating between various theories of crystal growth and glass formation.…”

Section: Introductionmentioning

confidence: 98%

Experimental andab initiostructural studies of liquidZr2Ni

et al. 2009

View full text Add to dashboard Cite

High-energy x-ray diffraction and ab initio molecular-dynamics simulations demonstrate that the short-range order in the deeply undercooled Zr 2 Ni liquid is quite nuanced. The second diffuse scattering peak in the total structure factory sharpens with supercooling, revealing a shoulder on the high-Q side that is often taken to be a hallmark of increasing icosahedral order. However, a Voronoi tessellation indicates that only approximately 3.5% of all the atoms are in an icosahedral or icosahedral-like environment. In contrast, a Honeycutt-Andersen analysis indicates that a much higher fraction of the atoms is in icosahedral ͑15%-18%͒ or distorted icosahedral ͑25%-28%͒ bond-pair environments. These results indicate that the liquid contains a large population of fragmented clusters with pentagonal and distorted pentagonal faces, but the fully developed icosahedral fragments are rare. Interestingly, in both cases, the ordering changes little over the 500 K of cooling. All metrics show that the nearest-neighbor atomic configurations of the most deeply supercooled simulated liquid ͑1173 K͒ differ topologically and chemically from those in the stable C16 compound, even though the partial pair distributions are similar. The most significant structural change upon decreasing the temperature from 1673 to 1173 K is an increase in the population of Zr in Ni-centered clusters. The structural differences between the liquid and the C16 increase the nucleation barrier, explaining glass formation in the rapidly quenched alloys.

show abstract

Semen analysis and fertility prognosis in andrological patients

Cited by 17 publications

References 16 publications

Solidification microstructures and solid-state parallels: Recent developments, future directions

Solidification microstructures and solid-state parallels: Recent developments, future directions

The Use of Semen Parameters to Identify the Subfertile Male in the General Population

Experimental andab initiostructural studies of liquidZr2Ni

Contact Info

Product

Resources

About